Precision Temperature Control Bluetooth Low & High Temperature Clamps with built in digital display Leading Technology, Superior Quality, Best Experience. Empowering you to work smarter! Model NST1, NST2 Temp Range -40~257°F (-40~125°C) Accuracy ± 2.3°F (± 1.3°C) Resolution 0.1 Sensor Type Thermistor Pt100 Temperature Units °F, °C Max. Tube OD 1-5/8″ (42mm) Battery Type 2 x AAA Max. Bluetooth Range Up to 450′ (150m) Display Type TFT Unit Weight 0.35 lbs IP Rating IP54