
Purchased to test preheating before welding in an industrial setting. I bought this with a certificate so we don't have to check it right away. Our quality program requires annual calibration. A year has passed and it has proved insufficient and unadaptable. This may be an isolated case with this product, but our contractor has not had any issues with other brands. Unfortunately, I bought a second one a little over a month ago. I don't trust the certificate anymore, so it's better to check the second one. I do not recommend purchasing this product.

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