No calibration required. Using MLX90640ESF_BAB infrared sensor. Displays center point, maximum and minimum temperatures. Take photos (can save 90 photos, 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 the middle button 3. Take photos: the middle button 4. View photos: the up or down button 5. Exit photos: Long the up or down button 6. Copy photos: Connect the computer with a USB cable, and the computer get a disk. Note:You cannot change the photos 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: 55x35 Power port: USB Type-C 5V/1A Rechargeable battery capacity: 200 mAh Working hours: 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.