We have three , one shows after one Year of use has a 10 degree drift One is currently working fine The third I called the company to find out how to calibrate it because after a year of use it was a 30 degree drift to know they couldn't can recalibrate you have to send it to the company mine needs to be replaced and for mine they said $128.06 I like the unit but I had a sensor failure due to broken wires at the end of the sensor connector on three different sensors. Our devices see many benefits every day. I was hoping for something indestructible.
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