Strap-On Pipe Thermometer for 3/8"-1.5" Pipe, 0-248F

I recently bought 4 of these gauges to use on my gas boiler heating system. I was a little skeptical after reading some of the reviews but after receiving them and installing them, I am well satisfied. I used 4 of these so I could monitor my boiler output temp, then regulate the output from the mixing valve to slab heat, see what the return temp from the slab is and then check the water temp back into the boiler. These gauges are very accurate, within 2° of each other, which was one of my main concerns. With these gauges permanently mounted, I can easily tell the condition of my heating system and make any necessary adjustments. I did use a small amount of transfer grease on the back of the gauge to help with heat transfer and they are working great.

Inaccurate!

i use it to keep an eye on the water temperature on my wood boiler without having to go outside.

These things are cheap junk, do NOT buy! Two of them side by side don't read the same temperature.

Not accurate, I have two of them side by side and they do not read the same. One on the pex line and it reads about 50 degrees low

I think they are good for a temp job to check a temp.

I needed a rough idea of the return water temp in my hydronic heating system. I bought two of these, and both worked exactly the same way: They were off by about 10°F up to 150°. At anything higher than 150°F, they were off by 40°F. Both were reading low as compared to an electronic probe and the boiler control itself, even with thermal paste in place. I could have lived with a 10°F discrepancy, but not 40°F. SupplyHouse.com was great about accepting the returns though- good vendor!

I was looking for a cheap solution to monitor the temperature of the return water on my hydronic heating system. I don't require ±1°F accuracy. I ordered one of these and installed it. It was accurate to within about 15°F until it hit 150°. Higher than that and the temperature was reading as much as 40° too low as tested by 3 other methods. I thought I had a defective gauge, so I ordered a 2nd one. Exact same results. I note that the brand name is "Mr. PEX", which suggests to me that it's really designed for PEX-based radiant systems. I don't know. SupplyHouse was great about sending them quickly and making the returns easy. I recognize that in this case at least, I was kind of a pain as a customer.

Easy to use and easy to read. Installed on a boiler that feeds an early radiant ceiling system.

I USE THEM ON MY SOLAR SYSTEM TO SET UP THE PROPER WATER FLOW TEMPERATURE FOR THE BEST HEAT RESULTS.THE STRAP ON THERMOMETER WORKS BEST IF YOU PUT A DAB OF HEAT TRANSFER PASTE BETWEEN IT AND THE WATER PIPE TO MAKE IT MORE ACCURATE.IT SHOULD COME WITH THE PASTE.ONE OTHER THING THAT I WOULD LIKE IT TO HAVE IS BIGGER, DARKER GRADUATION MARKS ON IT, ESPECIALLY THE TEN DEGREE MARKS SO IT CAN BE READ BETTER AT A DISTANCE.IT IS VERY EASY TO PUT ON A WATER PIPE.I NEED SEVERAL MORE OF THEM.I WOULD GIVE IT FIVE STARS BUT FOR THE ABOVE. SO I WILL GIVE IT 4 STARS.