Parts & Accessories Spare parts This device is an Extech RPM10 infrared tachometer and thermometer. Speed Measurement: Measures rotational speed (RPM) using contact and non-contact (laser) methods. Temperature Measurement: Features a built-in infrared thermometer for measuring surface temperatures from -20 to 315°C. Features: High accuracy up to 0.05% and a large display screen. Applications: Ideal for inspecting the temperatures of motors, bearings, and machinery.