REOTEMP S2-F1 Pipe Clamp Surface Hot Water Thermometer

I am using this on a hydronic floor heating system for the return (cold) side. I already have a combination temp/pressure gauge on the hot side, but its nice using this to see the return water temp side. It gives a good idea of the temp drop through the loops. Its a little loose on 3/4" pipe with the length spring they send, but you can shorten it up and it holds fairly well. If you are going to mount it where there is vibration you may want to consider gluing it to the tubing instead. Accuracy is.. close. I checked with a temp gun and it seems to be off by about 3 degrees at 155F. Obviously, wouldnt be using this on anything that requires a much greater accuracy, but for my purpose its just fine. We'll see how long it lasts - but no complaints so far.

Seems to be well made and accurate. Side note: (1) This product works through thermal conductivity, so there is going to be lag time until the display catches up. (2) Since the pipe I attached it to is round, and the back side of the thermometer is flat, I added thermal paste (nasty stuff to work with) to increase its surface area. (3) The dial face is adjustable, there are two very small set screws on the back. Loosen them and rotate the dial body to make your adjustments. So, overall I’m satisfied with my purchase.

The spring is too long for 3/4" copper. I put some bubble wrap behind the spring and the thermometer works fine.

The units works well. However they must be securely attached to the line. The springs provided does not work well on smaller pipe so wire ties may Suite you better as it did for me.

Work great on boiler loop of radiant heating system. They are confirmed accurate with the digital temp gauge used by our hvac technician. They stay in place on our vertical pipes.

This did not work as expected. It seems fairly heat-insensitive, and the time required for it to register heat in a pipe is long enough that any short bursts of hot-cold cycles will not be properly recorded.

Work just fine and easy to put on your pipes.

Gage was simple and easy to install on my heater hot water discharge piping. Surprisingly, this gage temperature readings obtained from contact with the outside surface of the pipe were very close (a few degrees cooler) to the readings from another nearby installed gage that senses temperature directly from contact with the hot water inside the pipe. A good quality gage that’s very reasonably priced. A good cheaper alternative to use this temperature gage vice trying to install a temperature gage in the piping system after the fact.

clammp system is a bit mickey mouse good guage