No calibration required. Using MLX90640ESF_BAB infrared sensor. Displays center point, maximum and minimum temperatures. Take p os (can save 90 p os, can be connected to the computer, can be copied and deleted). Rechargeable battery (200mAh). Application: High-precision non-contact temperature measurement; Security and intrusion detection; Temperature detection; Intelligent building environment temperature measurement and control; Car air conditioning control; Microwave and oven temperature detection and control; Temperature monitoring of industrial parts; Visual temperature sensor; Floor heating equipment side leakage and maintenance; Thermal detection of circuit boards and components Instructions: 1. Charging: Use USB Type-C cable, 5V/1A 2. Turn on/off: long press the middle button 3. Take p os: Press the middle button 4. View p os: Press the up or down button 5. Exit p os: Long press the up or down button 6. Copy p os: Connect the computer with a USB cable, and the computer will get a disk. Note:You cannot change the p os on the disk or put other files on the disk. Please fully charge and shut down before connecting to the computer. Name: Portable Thermal Imager Module: JM_MLX90640_CSB TFT display: 1.8 inches Display resolution: 160x128 Resolution: 32x24 Refresh rate: 8HZ Field of view: 55°x35° Power port: USB Type-C 5V/1A Rechargeable battery capacity: 200 mAh Working hours: greater than equal 4 hours Temperature measurement range: -40℃-300℃ Measurement accuracy: +/-2℃ (center area, 0-100℃) Operating temperature: 10℃-50℃ Operating humidity: less than equal 70% Dimensions:66x46x20mm Colour:Black Material:epoxy board Package Contents: 1 * MLX90640 thermal imager Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.