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AcuRite 00613 Digital Hygrometer & Indoor Thermometer Pre-Calibrated Humidity Gauge, 3" H x 2.5" W x 1.3" D, Black
Purchase options and add-ons
Color | Black |
Brand | AcuRite |
Product Dimensions | 2.5"W x 3"H |
Item Weight | 3.2 Ounces |
Mounting Type | Surface Mount |
About this item
- Maintain the Right Room Temperature and Humidity Levels: This wireless indoor thermometer/hygrometer combination is perfect to pair with humidifiers or dehumidifiers
- Simple, Easy-to-Read Display Monitor: View current temperature and humidity at a glance with this indoor thermometer gauge and humidity sensor
- Daily High and Low Indoor Temperature and Humidity Levels: Easily understand your range of conditions in any room with this home thermometer and humidity detector
- Switch Temperature Readings Between Fahrenheit or Celsius: This wireless home instrument measures indoor temperatures from 32 °F to 122 °F (0 °C to 50 °C)
- Sleek Design with Multiple Placement Options: Use the integrated keyhole for wall mounting, the magnet for placement on a metal surface (refrigerator or freezer), or the fold-out kickstand for use on any flat surface — the perfect desk thermometer
- Indoor Thermometer/Hygrometer Measurements: 3" H x 2.5" W x 1.3" D
- Company Based in Lake Geneva, WI, USA — Since 1943
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This Item AcuRite 00613 Digital Hygrometer & Indoor Thermometer Pre-Calibrated Humidity Gauge, 3" H x 2.5" W x 1.3" D, Black | Recommendations | dummy | dummy | dummy | dummy | |
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Price | $11.17$11.17 | -13% $19.99$19.99 List: $22.99 | -28% $18.68$18.68 List: $25.99 | -20% $7.99$7.99 List: $9.99 | -33% $9.34$9.34 List: $13.99 | -8% $11.99$11.99 List: $12.99 |
Delivery | Get it as soon as Monday, Mar 18 | Get it as soon as Monday, Mar 18 | Get it as soon as Monday, Mar 18 | Get it as soon as Monday, Mar 18 | Get it as soon as Monday, Mar 18 | Get it as soon as Monday, Mar 18 |
Customer Ratings | ||||||
Easy to read | 4.4 | 4.7 | 4.5 | 4.6 | 5.0 | 4.8 |
Accuracy | 4.0 | 4.5 | 4.3 | 4.4 | 5.0 | 4.5 |
Battery life | 4.4 | — | 4.5 | 4.6 | — | 4.6 |
Quality of material | 4.1 | — | 4.4 | — | — | 4.4 |
Durability | 4.0 | — | 4.4 | — | — | 4.3 |
Sold By | Amazon.com | Intek | Intek | Intek | Intek | Intek |
power source | Battery Powered | Battery Powered | Aaa Battery (Included) | Battery Powered | Battery Powered | Battery Powered |
battery quantity | 0 a, 1 aa | 1 aaa | 2 aa, 2 aaa | 1 aaa | 1 aaa | 2 aaa |
measurement accuracy | +/- 2 °F | ±1°F/°C and ±2%-3%RH | — | Accurate to ±1 Fahrenheit/Celsius and ±2%-3% | 1 | Temperature Accuracy: ±1°F |
upper temperature rate | — | 158 degrees fahrenheit | 158 degrees fahrenheit | 158 degrees fahrenheit | 158 degrees fahrenheit | — |
mounting type | Surface Mount | Tabletop, Wall Mount | Tabletop | Tabletop | Tabletop | Tabletop, Wall Mount |
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Product guides and documents
Videos
Videos for this product
1:12
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Review - My Thoughts After Owning This for 4 Years
Kay Iffert
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1:33
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AcuRite Hygrometer - Great device for homeowners
John & Melissa
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0:44
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Love this product for a couple of reasons
Jamie Schmieding
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1:22
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Great hygrometer for any room in the house
Christine Harris
Product information
Color | Black |
---|---|
Brand | AcuRite |
Product Dimensions | 2.5"W x 3"H |
Item Weight | 3.2 Ounces |
Mounting Type | Surface Mount |
Voltage | 110 Volts |
Item Weight | 3.2 ounces |
Manufacturer | Chaney Instruments |
ASIN | B0013BKDO8 |
Country of Origin | China |
Item model number | 00613B |
Batteries | A batteries required. |
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #1,865 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden) #3 in Weather Hygrometers |
Is Discontinued By Manufacturer | No |
Finish types | Painted |
Perfume | Unscented |
Care instructions | wipe down |
Assembly required | No |
Number of pieces | 1 |
Warranty Description | 1-year limited warranty. |
Batteries required | Yes |
Included Components | Digital Display, Acurite 00613A1 Indoor Humidity Monitor, Instruction Manual |
Import | Imported |
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Product Description
An all-in-one digital indoor home thermometer and humidity gauge, the AcuRite Indoor Humidity Monitor gives you a full picture of your inside world. With an easy-to-read display, you’ll receive accurate humidity monitoring and accurate room temperature measurements. It features an indoor hygrometer for % relative humidity, an indoor thermometer gauge for temperature readings in degrees Fahrenheit and Celsius, a humidity level icon to indicate high, low, or ideal indoor conditions, and daily high and low temperature and humidity records. You can mount this indoor thermometer/hygrometer on a wall, stand it upright with an integrated fold-out stand, or place it on a metal surface like a refrigerator or freezer thanks to its magnetic back. Why use an indoor air monitor? Using a temperature monitor and humidity meter will allow you to ensure proper indoor humidity, which can yield skin, allergen, and other health benefits. Too much humidity can encourage the growth of mold, bacteria, viruses, fungi, mites, and other asthma-inducing agents. Overly dry air can lead to nose irritation, skin irritation, breathing difficulty, and damaging static electricity. Correct humidity can encourage plant growth and assists with the comfort and health of pets. Use this digital hygrometer to monitor a grow room in any location or as the perfect thermometer and hygrometer for a cigar room (humidor) or wine cellar. This humidistat, optical thermometer will help you improve your home environment through the power of knowing temperature and humidity. A perfect gift idea for new homeowners or for birthdays, Christmas, or Father’s Day, it comes with a one-year limited warranty.
Top Brand: AcuRite
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Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers like the accuracy, value, performance, and readability of the humidity meter. They mention that it's extremely accurate, works great to monitor the temperature and humidity, and has a clear display. Overall, customers recommend the product for its ease of use and affordability.
AI-generated from the text of customer reviews
Customers like the performance of the humidity meter. They mention that it works well, is accurate, and is useful. Some customers also say that the display performance is great and that it's affordable. Overall, customers are happy with the performance and usefulness of the product.
"...That is very useful. Great price and delivery from Amazon. I bought more, so I'm happy & satisfied with my purchase. Recommend." Read more
"...This little device has been so handy and even saved me money on my electricity bill by keeping me aware of my heat usage...." Read more
"These hygrometers are very helpful to have in the house. They are inexpensive but seem accurate...." Read more
"...Once we used a 1.5v battery, it began to work accurately!" Read more
Customers like the accuracy of the humidity meter. For example they say it's extremely accurate, excellent for checking the humidity, and provides accurate temperature readings. The meter is lightweight, compact, and does a pretty accurate job in keeping the humidity and temperature. The calibration process is simple, and it fits anywhere. Customers also appreciate the convenience of seeing all the data at once.
"...ice melt (calcium chloride) provide an inexpensive and convenient way to calibrate (or check accuracy) of a hygrometer over a range of temperatures..." Read more
"...Looks great too, best of all it's accurate! I like the it keeps highs and lows of temp & humidity levels for past 24 hours. That is very useful...." Read more
"Was about to return as the readings were not accurate...." Read more
"...They are inexpensive but seem accurate...." Read more
Customers like the humidity of the product. They say that it provides accurate humidity and temperature readings across a useful range. The product is small and easy to use, and it helps them monitor the room's humidity levels. The temperature seems relatively easy to measure with a higher degree of accuracy than other devices. The humidity reading did in fact drop quickly, and matched the readings of tests they conducted with the product, making it easy to keep track of the temperature fluctuations.
"...attractive features of the AcuRite are: seemingly very accurate humidity and temperature readings across a useful range of humidities and..." Read more
"This Accurite device gives me good general idea of temps and humidity. Accuracy not that important...." Read more
"It's a good product, but I noticed that I acts up after 85% humidity." Read more
"Humidity and room temperature are easy to read. It display the comfort room humidity in relation with room temperature...." Read more
Customers appreciate the value of the humidity meter. They mention that it does what it says, is accurate enough for the price, and is a real steal.
"...and min humidity and temperature occurred within 24 hr interval and low cost...." Read more
"...That is very useful. Great price and delivery from Amazon. I bought more, so I'm happy & satisfied with my purchase. Recommend." Read more
"These hygrometers are very helpful to have in the house. They are inexpensive but seem accurate...." Read more
"...It's worth the buy." Read more
Customers like the readability of the humidity meter. They mention that the screen is easy to read, and the size is perfect. The product is easy and accurate to use and read, with a clear display.
"Very easy to read, even from across the room. Looks great too, best of all it's accurate!..." Read more
"I like that it is easy to read, and the magnet for attaching to the refrigerator upstairs and the furnace in the basement...." Read more
"self standing or magnetic mount nice little unit easy to read" Read more
"...Overall, the devices is easy to use and is easy to read as long as there is a light source to read it with...." Read more
Customers find the humidity meter easy to use. They mention that it has a super simple operation, it's easy to turn on the air conditioner, and it works without any configuration. They also appreciate the small size and the fact that it can be set on a table like a photo frame.
"...This is very easy to do for anyone. Just put the AcuRite in the sealed bag overnight then check the RH reading the next morning and you are done...." Read more
"...Things I love: one AA battery, easy to put in and use (multiple AAA's often have connection issues), LOVE the magnetic holder on the back that will..." Read more
"Nice interface. Yikes, my apt is dry this winter. I did calibration test and this came out as 99 % accurate, so it’s good enough...." Read more
"Easy to use. Note the battery is NOT included." Read more
Customers are mixed about the quality of the humidity meter. Some mention that it's well-made, accurate, and durable, while others say that the build quality is not very sturdy.
"We have many of these in the house, shop and greenhouse. Accurate. Durable. Dependable. A battery lasts a long time in them...." Read more
"...some force I was able to get it back on, but it seems these might not be very sturdy." Read more
"...and also has a nice little stand you could use instead. This unit is compact, easy to read and perfect as far as I'm concerned...." Read more
"...I've owned have had the exact same issue with the extremely fragile piece on the backside that allows you to clip it onto your belt, pocket, pants,..." Read more
Customers are mixed about the temperature accuracy of the humidity meter. Some mention that it keeps highs and lows of temp and humidity levels for the past 24 hours, and it includes the ambient temperature. However, others say that the temperature was inaccurate, and there was an issue with the temperature readout.
"...The temperature reading is also quite accurate. It is very desirable to have a high accuracy humidity monitor and thermometer for use at home...." Read more
"...I bought a couple of these from Amazon and discovered an issue with the temperature readout...." Read more
"...Looks great too, best of all it's accurate! I like the it keeps highs and lows of temp & humidity levels for past 24 hours. That is very useful...." Read more
"...immediately it's not completely accurate because the hygrometer will change percentage from one # to another within seconds at least several times...." Read more
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The procedures I used to do a comprehensive calibration are given below.
Using these two saturated solutions, my measurements on the AcuRite I bought showed that for temperature from 39 deg F to 79 deg F and for relative humidity from 29% to 75% , the max error is 3% off in humidity occurred at very low temperature (39 deg F) (i.e 37%RH is actually 40%) and near room temperature, the error is only 1%RH. (Lucky me!)
Actually, the AcuRite is both a digital humidity monitor (hygrometer) and a digital thermometer. The AcuRite I tested is surprising accurate over a practical range of temperatures and a practical range of relative humidity values (see details given below). The temperature reading is also quite accurate. It is very desirable to have a high accuracy humidity monitor and thermometer for use at home. In the summer, a high humidity house is uncomfortable. Worse yet, a humid basement smells foul allowing mold to grow and humid closets cause clothes to smell bad - a nightmare for many housewives. Knowing accurately the humidity allows one to take measure to lower it. With seemingly high accuracy, the AcuRite is surprisingly cheap.
The comfortable relative humidly(RH) range to human body is recommended to be a region around 45%. American Society of Heating, Refrigerating and Air-conditioning Engineers Inc. (ASHRAE) recommends:
---RH ---------temperature ---- season
30- 60%----- 68-75degF -------winter
30- 60%----- 73-79degF ------summer
"Elevated relative humidity can promote the growth of mold, bacteria, and dust mites, which can aggravate allergies and asthma" and "Relative humidity levels above 70% may lead to the development of condensation on surfaces and within the interior of equipment and building structures. Left alone, these areas may develop mould and fungi." Typically, room temperature is set at 70degF. Also I preferred a RH of 50%. At 45%RH, I feel dry and my skin starts to wrinkle.
Sodium Chloride saturated solution is commonly used to calibrate a hygrometer (humidity monitor) at room temperature (70 deg F) which should give 75%RH. Thus the hygrometer needs to be calibrated again with another source with lower RH, such as Calcium Chloride (31.5% RH at 70 deg F) or Magnesium Chloride (33%RH at 70 deg F). If the hygrometer agrees with one of these values then one can assume it is accurate around 50% RH. If the hygrometer is used only at room temperature, it only needs to be calibrated by two saturated solutions (for example sodium chloride and calcium chloride). However, I have calibrated from 39 to 79 deg F.
Table salt (sodium chloride) and driveway ice melt (calcium chloride) provide an inexpensive and convenient way to calibrate (or check accuracy) of a hygrometer over a range of temperatures and humidity values. I have calibrated my AcuRite unit by using sodium chloride and calcium chloride saturated solutions, each of which was placed in a ziplock bag together with the AcuRite.
An accurate hygrometer is expensive and bulky and I was surprised at the seemingly high humidity accuracy of the Acurite which I purchased from Amazon. The attractive features of the AcuRite are: seemingly very accurate humidity and temperature readings across a useful range of humidities and temperatures(see calibrations given below), records the max and min humidity and temperature occurred within 24 hr interval and low cost. Also the display font for humidity is large enough for convenient viewing. These features are not expected from a $10 device.
Calibration using saturated table salt (sodium chloride) solution
Calibration is based on published measurements of equilibrium relative humidity(RH) vs temperatures above saturated salt solution by scientist(s). I will use these published RH values as standard. For table salt saturated solution, the published RHs, given below, surprisingly are almost a constant from 32 to 104 degF(the measurement increment was 5 degC).
Temp (deg F) RH(%)
32-59 76
68-104 75
I found that there was no different from using table salt with and without iodine. So I used the former. I also found that salt slurry did not work well. I sealed the AcuRite and two plastic cups in a ziplock bag which was further sealed by Scott tape. Each cup has at least 1/8 inch of undissolved salt (at the highest temperature of measurement) with at least 1/8 inch of water above it. Each deg F change can cause 3% change in RH. Since the AcuRite with battery is a big thermal mass, I made sure that for each measurement, the temperature and RH were stable for at least 1/2 hr, a condition which turned out to be most difficult to meet. Measurement results are given below. I found that for temperature, the AcuRite seems to be about 1 deg F higher than another temperature meter which has fractional deg F. However, I will use the temperature displayed by the AcuRite. Low temperature measurements were taken in a refrigerator. It took about one week to do all the measurements.
Temp (deg F) RH(%, measured) RH(%, from standard) Error(%)
41 74 76 -2
72 75 75 0
75 77 75 +2
77 76 75 +1
88 77 75 +2
90 76 75 +1
From the above table, at room temperature of 72 deg, the error is zero and from 41 to 90 deg F, the max error is 2%RH. I would say this is quite acceptable for home use. Next, I checked if the humidity is linear over a range of RH values and a range of temperatures by using another saturated salt solution.
Calibration using saturated calcium chloride (CaCl2) solution at low humidity
A better and purer source for calibration at low humidly is magnesium chloride. Over its saturated solution, the RH is 33% over practical temperature range. Pure Magnesium Chloride is available from amazon or ebay sellers. Another good source to use is Potassium Carbonate which another reviewer in this forum had used and which is also available from amazon or ebay. The equilibrium RH is 43% from 0 to 30 degC. However, I didn't want to spend the money and trouble to get them.
I found that I have some Prestone Driveway Heat ice melter (available from Home Depot and Lowes) which turned out to be Calcium Chloride. But the purity of the source was unknown and this would cast doubt on the results. From the internet, I found that the published equilibrium relative humidity(RH) vs temperatures above saturated calsium chloride solution are:
Temp (deg F) 41 50 59 68 77
RH(%) 40.0. 38.0. 35.0. 32.0 29.5
RH vs temp seems to be linear and the slope is bout -0.3%RH per deg F
My measurement results are:
Temp (deg F) RH(%, measured) RH(%, from standard) Error(%)
39 37 ~40 -3
79 28 ~29 -1
Thus at each temperature, there are now two data points.
If the calcium chloride measurements were believable due to the unknown purity of the calcium chloride source, then the linearity of the humidity of Acurite over a temperature range from 39 to 79 deg F and over a humidity range from 29% to 75% is quite good for home use as the max error is less than 3%RH occurred at 39 deg F, which is too low for normal use. Near Room temperature , however, the error is about 1%RH, which is remarkably small.
I believe that the humidity detector is polymer on a capacitor. Capacitor is a linear device and should response linearly to humidity absorbed. Thus for each temperature if two measured data points agreed with published data by other scientists, then it is sufficient to determine the accuracy and linearity at that temperature. I have verified the data agreement from 39 to 79 deg F. (Note that the calcium chloride purity is questionable. But the measured data did agree with published values.) Thus, within this temperature range, the AcuRite unit I bought seems to be accurate and linear. Ideally, one would like to further calibrate the unit with magnesium nitrate saturated solution which has a RH of 50-55% across practical temperatures. This would give three data points on a straight line to verify the linearity. However, I do not know how to get it easily and cheaply.
In Summary: for temperature from 39 deg F to 79 deg F and relative humidity from 29% to 75% , the max error is 3% off in humidity occurred at very low temperature (39 deg F) (i.e 37%RH is actually 40%) and near room temperature, the error is only 1%.
Max humidity
After I wrapped the AcuRite in a wet paper tower, the humidity was 99%, the expected value.
Update rate and modify the back cover to increase airflow through the unit
For normal use, no modification is need as modification does not change the accuracy of humidity and temperature. Allowing more airflow than necessary may shorten the life of the unit by quicken the contamination of the humidity detector inside the unit. Modification only changes the response time when the humidity changes. For home use, the humidity and temperature are not expected to change so fast that the unit could not keep up.
The unit updates the humidity and temperature about every 15 sec. After initial testings which showed that the unit was accurate, I invested time to modify the cover of the unit as the airflow through the unit is through a grill and could be increased to have a faster response time. Steps for the modification are given below:
1) The cover is held by 4 small screws. Remove them by a jewelry screw driver.
2) Separate the back cover from the main body gently and not too far apart as there is a ground wire of the battery housing connecting the two.
3) Remove the ground wire from the battery housing. Now the two parts can be separated.
4) There is a plastic stick used for changing deg C to deg F. It will fall out but is easy to put back during re-assembly.
I drilled four 3/16 inch holes on each side of the back cover as well as one 3/16 inch at the center of the back cover.
The above measurements were done on just one AcuRite which I bought. Because measured data points seem to agree with published values by other scientists, I am satisfied that the humidity and temperature of my unit are accurate and use it with confidence. However, beware that there are a large number of reviews in this forum who said their AcuRite is no good.
Reviewed in the United States on December 7, 2023
Beware 3rd party sellers here on Amazon price gouging this item. Same as Amz, Home Depot also sold this item for 13 and change, but is sold out now. Then 3rd party selling for a few dollars more, and as high as 25 bucks each. Shameful and pathetic how some folks want to earn a buck. And Amazon lets it happen. This a retail site. Go do those other business practices on Ebay.
Highly recommended for people who realize that home humidity is important.
Top reviews from other countries
Tengo ya tiempo con el y funciona de maravilla, estoy por comprar otro para otra habitación que requiero monitorear niveles de humedad.
IMO pretty much a requirement for your pet (although not as good as a unit with a temp/hygro probe).
Don't use ANY thermostat with adhesive in a reptile terrarium! They use it as leverage while roaming/climbing and WILL pull off the Velcro.
The 3m adhesives used on store-brand stick-on thermostats will adhere to your snake/reptile's skin and they tear multiple/all layers of skin trying to escape.
THIS Accu-Rite thermostat/hygrometer and other reliable Probe thermometers are safe.