Home > Consumer Reviews > Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer

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.

The Honeywell TM005X Wireless Thermo-Hygrometer is a great monitoring tool for home and work. With its easy on the eyes display it is an ideal way to monitor temperature and humidity. This particuliar unit is packed with one remote sensor. One may piggyback up to 3 additional sensors. The monitor can be mounted or operate free standing.

Both monitor and sensor operate off of 2 AA batteries. The monitor is silver and black and measures 4.33" x 4.86". It blends well in most decorum. The 2" x 4" sensors are white with a display screen measuring .5" x 1".

Purchased primarily for indoor use these devices have worked well. As with all monitoring devices I calibrate these quarterly for accuracy. For the price paid I am somewhat surprised with the on the money readings. The system has more then paid for itself. Definitely a great low cost tool that works.

The item comes comes with a main unit and a remote sensor. The main unit(displays inside Temp/RH) should be placed inside and the remote sensor(displays outside Temp/RH) be placed outside or inside. Distance between both of them should not be more than 100 feet(30 metres) and no obstacles between them.

I feel both show temperature correctly but relative humidity(RH) incorrect to a great extent. While the weather.com says RH to be around 70%, remote sensor when placed outside shows it to be around 25%. Of course, its common sense, outside RH will never be that low. Even the main unit which says 40%-70% RH is good, never reaches that level. It displays around 30% RH most of the time, I tested in many different conditions where the RH is definitely supposed to be high. I have been using this unit since 4 months.

I received the product timely however when I put it on the wall, the LCD display was only partially visible. When put on the wall it does not completely display the numbers so it is basically unreadable. We tried new batteries but that did nothing to improve it. We called the seller and a recording told us they had our ID and number and would respond. I also sent an email the same day and never received either an email reply nor a call from the seller. This has been going on since Dec 15 2008. I'll try once more to contact them. If no reply I will return it and ask for a refund. Good idea, just couldn't get it to work and apparently Customer Service doesn't care about their customers.

Purchased it based on positive reviews here as I wanted to measure mainly humidity in my living room and bedroom (got SPT SU-4010 humidifier from Amazon, great unit btw.). Was excited to see that the display is large and easily readable even from opposite side of the room (it is not illuminated, however). Temperature measure with both main and remote unit is comparable with just 0.1-0.3C difference and is almost the same measured with any other digital thermometer in my house. Unfortunately, I can't same the same about humidity. Main unit usually display 15-20% less than remote unit, even they are located 5 inch away from each other. And main unit measures almost 35% less humidity than my old meter which is almost impossible as it is definitely not 5% humidity inside my house. I put Honeywell devices outside and they even can't measure the humidity ("--" displayed). Online weather station shows that humidity in my area should be about 40%, not "--"!

I wish the remote sensor information was displayed on the main screen all the time...I should pres a button to get it. You must get 4 AA batteries as thy are not included. FYI, main unit is 4.5x5x1 and remote is 2.25x4.25x1 in.

I'm going to return it for replacement (it was sold via Amazon by ANTonline so I have to send it to them) and will update my review.

Update [a week later]: ANTonline policy doesn't cover replacement of defective units - you must send it to them, pay for shipping, they will inspect the unit and will decide what part of original price they will refund!!! I spoke with CS representative on the phone today and he confirmed that they don't exchange defective units - the only thing they offer is refund. I guess it is better to wait a little bit and send it to manufacturer for replacement (manufacturer will not repair/replace your unit if its within 30 days of purchase date, I asked them already).

Again, if you want this unit, look at any other seller than ANTonline with better return/replacement policy.