Amprobe RTD-10 Dual Input Digital RTD Thermometer Resistive thermal detector (RTD) dual-input meter measures temperature, and is used for HVAC, indoor air quality, and environmental applications External, 100 ohms, platinum RTD temperature sensor measures temperature in F and C Meets RTD standards Pt385, Pt3916, and Pt3926 Displays minimum and maximum temperature with elapsed time, and average and relative temperature, and data hold saves readings for recording Warning beeper with user-selectable high and low settings