UPDATE: I'm correcting as I needed an insulated thermocouple and it isn't insulated which explains the 'wrong' readings I got when it was installed in a metallic (grounded) object. Upgraded to 3 stars to be fair. I wish they would update the description to indicate it's not isolated. FIRST CHECK: error after approx. 20 hours of operation. Exactly these 20 hours worked. Wouldn't buy again.
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