Sellers use smoke and distortion about product accuracy in the listing. Poor accuracy in the device.

Listing hides understanding by reporting accuracy as "+/- 2%". Correct units would be plus or minus degrees Fahrenheit or Centigrade.

At their website the misinformation continues, reports this same %, as either plus or minus 2 degrees F OR C, which are completely different. I think what their sales people mean is that the true temperature when the device reads 100C is somewhere between 98-102C.

This would translate to the Fahrenheit scale as 212F, or 100C, so if the device measures 212F, the true temperature is somewhere between 208.4F to 215.6F

This implies that the accuracy of the device gets worse as the temperature increases?

OK for ball park measurements, but if your food needs to be at 180F, you need to measure at 184F to be sure, because of device accuracy.
Sellers use smoke and distortion about product accuracy in the listing. Poor accuracy in the device. Listing hides understanding by reporting accuracy as "+/- 2%". Correct units would be plus or minus degrees Fahrenheit or Centigrade. At their website the misinformation continues, reports this same %, as either plus or minus 2 degrees F OR C, which are completely different. I think what their sales people mean is that the true temperature when the device reads 100C is somewhere between 98-102C. This would translate to the Fahrenheit scale as 212F, or 100C, so if the device measures 212F, the true temperature is somewhere between 208. 4F to 215. 6F

This implies that the accuracy of the device gets worse as the temperature increases? OK for ball park measurements, but if your food needs to be at 180F, you need to measure at 184F to be sure, because of device accuracy.