Extech HD200 Differential Thermometer Datalogger + IR ThermometerExtech HD200 Differential Thermometer Datalogger + IR Thermometer Differential Thermometer Datalogger + IR Thermometer Differential and Non contact InfraRed Temperature measurements Take differential temperature readings with dual Type K thermocouple probes plus non contact surface temperature measurement using IR Thermometer Probe (included) Key Features: Datalogs up to 18,000 readings on each channel Display [T1, T2, T3(IR)] or [T1 T2] or [T1 T3] or