I am a full time HVACR technician. I have tested this clamp with two other thermocouples in known operating condition, Digital Testo and Fieldpiece. Both read the temperature on the same section of the suction line to within half a degree. This thermocouple showed up to 10 degrees less. The clamp itself feels solid and holds the pipe well, but if it can't be used invest in the right tool.
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