La Crosse Technology TX29U-IT 915 MHz Wireless Temperature Sensor

First off, heed the warnings from the manufacturer: don't put these in locations where they can get heavily rained on, and don't put them in direct sunlight.I purchased this sensor as an add-on to a LaCrosse Weather Station so I can monitor an additional location. I've had it for a number of months now. This sensor is located in the backyard, attached to a deck underneath an overhang so it doesn't get too wet.I live in a part of the country where the winters are long and harsh. We've had temperatures below freezing for almost two months straight now, with a low of -15F so far this season, and this sensor is still working. If it makes it through May (the end of our winter) I'll be surprised. I'll post an update if I have any problems!UPDATE: Sept 28, 2009 (9 months after original review above): This sensor lasted all winter and summer, despite having snow accumulate on the top during the winter and lows of -15F and winds of 80mph... amazing. Keeping my fingers crossed that I'll have as good of luck this winter too!UPDATE 2: April 24, 2010 (16 months after original review): Sensor still going strong, and still using the original battery! Made it through another long and harsh winter. For the price and considering the weather this sensor has endured, it is an AMAZING value. If I wish to replace the indoor weather station in the future, I will definitely look for one that is compatible with these sensors.UPDATE 3: November 17, 2010 (23 months after original review): I almost feel ridiculous coming back here to update on this product again, but this thing is still working. I just don't understand it! I noticed that the top sometimes has snow on top of it (yes, we just got 20" over the past week), so it isn't as well-protected from the elements as I originally thought... yet it is still working and still accurate! I can't believe that I am gushing over a $15 temperature sensor LOLUPDATE 4: January 28, 2011 (25 months after original review): Well, the batteries in one sensor finally died last month. I replaced the batteries (old and new ones are Duracell Ultras) in both sensors and everything is working great again. On a side note: we had temperatures of -20F over New Year's weekend with wind chills of -51F (its ridiculous and true). Guess what? Outdoor sensor worked fine and was within 1-2 degrees of actual temperatures registered by others in the area using their much more expensive equipment. :)UPDATE 5: December 14, 2011 (3 years after original review): They're still going strong!UPDATE 6: February 1, 2013 (4+ years after original review): Both are still working and still accurate!UPDATE 7: October 12, 2014 (almost 6 years after original review): Someone commented on the review and it made me realize I should update. They're still working fine. I consider this luck at this point. :)

Good quality at a fair price.They work as advertised.Very accurate and reliable.I use them in my greenhouse, with the receiver/base sitting in our kitchen.The Greenhouse sensors are approximately 75’-85’ from the receiver/base.

Once it connects with the base station, this sensor unit provides precise and regular temperature readings. I use it to monitor temperatures in my backyard greenhouse from inside the house, to adjust vents, shades and fans. This model(915MHz) has no problem sending a signal about 60 feet though a house wall.This is my second sensor. My first has been in operation for over 2 years and I thought It had died after it got rained on. When I got the 2nd sensor and it did not seem to work either, I found that the battery in the base station was the problem. The base station display had not dimmed and nothing on the base station display suggested its battery was low. A design flaw.But my mistake points to the key design flaw: there is no way of telling if the sensor reads any temperature or if it transmits its reading and one cannot select the channel. I wish I had more direct control in setting up the radio connection (eg Channel selection button, push button to transmit). Instead it is all automatic, but frustrating to debug.The instructions say to remove batteries in both the base and the sensor(s). When the batteries are reinstalled within 30 seconds of each other, the units invisibly cycle through varies channels trying to pair with one another. Sometimes they find each other within a couple of minutes, other times they never do. The base and the sensor cannot be too close or too far of each other for the pairing to get established,and orientation seems to matter. Sometimes they find each other within a couple of minutes, other times they never do. You have to keep removing the batteries, waiting for any memory to dissipate, reinstalling the batteries, hoping for success.Fortunately, once they hook up, you can move the sensor quite a distance from the base and they stay connected for at least 6 months(until a battery dies). The temperature reading may occasionally disappear due to an interference, but it will come back on its own.