Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
- Jumbo LCD display for easy readings from across the room
- Wireless sensor transmits temperature and humidity data from up 100 feet away
- Main display receives data from up to 3 sensors (other 2 sold separately)
- Toggles display from temperature to humidity bold digits for easy reading of both
- Memory for minimum and maximum recorded data such as temperature highs and lows
The Honeywell TM005X Wireless Thermo-Hygrometer is an easy-to-read and economical way to track temperature and humidity in your home or office. Featuring a jumbo display unit with one-inch tall digital numbers, this sleek silver and black unit can mo
Rating: 
(out of 136 reviews)
List Price: $ 29.99
Price: $ 21.58
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Review by David Scarpetti for Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
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I was most interested in the humidity measurement. I conducted a calibration****(See update at end of review) with a sling psychrometer. A sling psychrometer measures wet bulb/dry bulb temperature and is the least expensive (albeit a bit tedious to use) and most accurate way to determine relative humidity (RH).
I needed to know relative humidity for curiosity indoors and for a chamber in my basement used to dry cure sausage (I needed a 70%RH environment). The Honeywell unit was spot on with the sling psychrometer (and temp. was accurate as well).
The unit is new; I need to check it over time for accuracy. However, it’s running very well so far and the price is right. I’ll be buying more remote sensors [...] I found the remote sensor part no. is TS33C, can find them on Amazon with that search).
The majority of complaints say the humidity is “off.” However, I didn’t see a single valid calibration conducted.
Update 01-March-2009
I just took the main unit, the sensor and sling psychrometer. The conditions in my home at time of testing were 68F and 30% relative humidity.
Main unit read 68.4F/30% RH
The Sensor: 68.0F/30% RH
Sling Psychrometer: 68F/31% RH
The sling psychrometer consists of two sealed thermometers and will never need a calibration, it is an accurate standard. This Honeywell Unit is pretty darn good.
Update 13-Dec-2009
Someone contacted me and corrected a big point. I did not calibrate the unit by adjusting it to a known standard, I simply compared the values. My apologies for this rather serious error.
Review by Mechanical Engineer for Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
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As an engineer, I am particular about accuracy. Some others have complained about differences between the temperatures and humidity reported by the base and remote when left adjacent to each other. I recognize that the base and remote can have different response time and under varying conditions could be expected to report different numbers even when next to each other. So I decided to perform an informal test. I placed the base and remote in a large picnic cooler with a gallon jug of water (for its thermal mass) and waited about 24 hours for everything to come to equilibrium. The temperatures were then identical between the base and remote and the humidity readings were an indicated 5% different. To take the readings I had to open the cooler. A better test would be done by cutting a window in the cooler and taking readings over time without disturbing the sealed environment surrounding the base and remote.
The temperature readings were accurate to about 0.5 degrees of a bulb thermometer that I trust to be accurate. The humidity readings made sense and a difference of only an indicated 5% I think is very good for an inexpensive instrument.
I like that the display can be set to alternate between the base and remote readings. I like the large numerals. I am able to leave the remote out on a screen porch and read the data upstairs. For home use, I don’t think this product could get any better.
Review by Riverside for Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
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This thermometer/hygrometer has a large, easy to read display. I bought this primarily for the hygrometer and it’s proven to be sensitive and accurate, both indoors and out. The product comes with a wireless outdoor (or other location) sensor that is easy to set up. You can add two additional sensors (not included). Although it’s designed to sit on a table or shelf, it can also be hung on the wall. This might affect the hygrometer’s sensitivity since the sensors are on the back. Haven’t tried the wall mount.
Review by Meiyi for Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
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I have purchased this due to the high reviews. It however turned out to be a disappointment. First of, I did followed the instructions to put batteries in remote unit first, reset it, then put batteries in the main unit. Every time the main unit gets reset, it seems to start from 80F temperature & 20% in humidify, and very slowly adjust from there. After numerous resets, I was still unable to get the main unit to display same info shown in the remote unit, even when placing them side by side. The main unit seems to always be 4-8% off in humidity compared to the remote unit. As for temperature, the main unit also varies from the remote unit. It can differentiate from 2.6 F to as accurate as 0.1 F, compared to data shown in remote unit. The remote seems more accurate then the main unit. The main unit and the remote unit have buttons (requires paper clip to reach) to adjust the display from Fahrenheit to Celsius & vice versa. I however, was unable to get the remote to display in Fahrenheit. It was stuck displaying in Celsius.
Other than these negatives, the unit itself is pretty nice. It has a big display; the digital numbers are about 1 inch in height in the main unit. The remote unit also has a digital display, although it’s much smaller than the main unit. I guess if you’re looking for a unit to just display the temperature, this may not be a bad device. However, as a hygrometer, this definitely is not the unit to be using for accuracy. I will be returning this unit, since I am looking for a hygrometer…
Review by Philip Lam for Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer
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Works well except for slight differences in temperature and humidity between base and remote unit. Remote sender is being used for reporting conditions in my greenhouse. It serves that purpose very well.
It is a real bargain also.