The Testo 115I clip thermometer is ideal for maintenance and troubleshooting in refrigeration, air conditioning, and heating systems. It is also useful for measuring flow and return temperatures. - NTC measuring range: -40 to 150 °C - Accuracy: ±1.3 °C (-20 to 85 °C) - Resolution: 0.1 °C - Operating temperature: -20 to 50 °C - Material: plastic - Requirements: iOS 8.3 or later, Android 4.3 or later, Bluetooth 4.0 - Battery type: 3 AAA Micro batteries - Battery life: 150 hours - Bluetooth range: 100m - Dimensions: 8.99 cm (Width) x 2.99 cm (Height) x 18.29 cm (Length) - Weight: 0.127 kg