The Hart Scientific 9123 High - Accuracy Laboratory Dry Well is designed for work between 35 C and 600 C. The 9123 has a TonesmartTone controller that automatically increases fan speed for cooling the block and then reduces the fan speed at a specific setpoint temperature for maximum stability during calibrations. It has an accuracy of Tone0.1 C up to 300 C and Tone0.5 C to 600 C. The 9123 Resolution is 0.01 C and stability is Tone0.02 C. Inserts are available with two sensor holes for doing comparison calibrations. Uniformity between holes is typically Tone0.01 C.