Fieldpiece ST4 Dual Temperature Meter, -58 to 2000F(-50 to 1300C)

I love this thing. My GF thinks I'm crazy because I take reading all across my house. Ideal for measuring delta T temps from return and supply. I also use it to measure subcooling and superheat. Easy to use and calibrate using ice water.

This meter is very accurate and works great. I found the included thermocouples cumbersome to work with so I went out and bought the clamp on style. I turned the included thermocouples into wet bulb thermocouples with an old hollow shoe string and alligator clips.

Excellent

Fieldpiece usually makes very good instruments. This one seems to be well built as well. The only thing I don’t like is that the k type thermocouple wires are very stiff and not very nimble. There are better k type thermocouples on the market that are more flexible.

Pros:- Fast accurate readings of two probes- Solid construction- Good battery lifeCons:- Have to press a button to switch between the two probes, would be nice if both could be seen on screen at the same time- It's a tad bulky- The thermocouples it came with were poor quality and both broke quickly- The carrying case it came with is pretty bad and I ended up just tossing it

Used it the first time this weekend to check the temperature on my hvac while adding additional Freon. Worked great and I calibrated it beforehand. Temperature was very accurate. I would highly recommend.There are attachments that can be purchased. I bought the hose clamp attachment.

GREAT TOOL FOR FINDING A TEMPERATURE DIFFERENCE (Delta T). WORKS LIKE A CHARM

Using a calibrated mercury lab thermometer for reference, both thermocouples were within 1 degree or less at various temperatures in liquids. Both thermocouples matched each other usually exactly and never more than a couple tenths of a degree off.This is a great tool for HVAC work. And you'll find plenty of other uses for it. I didn't calibrate mine as it wasn't needed out of the box, but you have that option too.The plastic case feels like cheap overly hard plastic. But the soft armored cover is good and makes the plastic of no concern. So I think it a pretty high value instrument vs others costing much more for the same purpose.