I have been stuggling with temp measurement. I started out with a cheaper ($200 - China) multimeter with temp probe. Then I borrowed a little solid temp probe from work that had a long straight metal shaft with the probe inside. This second probe read 2.3 degrees C different to the original. I then thought I'd buy a thermometer from B&H (the Patterson one) with as much accuracy as possible (0.1 degree graduations). Alongside that purchasing decision, I went and bought a calibrated multimeter as well (an expensive Extech 570A which is really 'accurate' ...) (This mulitmeter will replace the other Chinese one for all functions - it aint just a temp meter !)
The Extech and the thermometer are about 1.5 degrees C different. The Extech and the original Chinese one are about 2.5 degrees C different. The Extech is reading similar to the probe from work.
Which one do I trust ?? Just how accurate are the thermometers ?? I know the thermometers are certainly slower to repond to variations.
Given that 1 degree matters in processing ...