What is the accuracy of hotplate temperature control? Hei-PLATE hotplate temperature is set in 1°C intervals. With a Pt1000 probe, measurement resolution is 0.1°C. Measurement accuracy is ±0.2°C plus the tolerance of the Pt1000. Final measurement accuracy scales linearly from ±0.2 K at 25°C to ±0.75°C at 300°C, then up to ±2.05°C at 350°C.