HT-A2 3.2in TFT Display Screen Thermal Infrared Imager Camera Detector Features: 1. . 2. This product is an infrared camera that integrates surface temperature measurement and real-time thermal image. 3. The central point measurement cursor is used to locate quickly and accurately to measure the temperature of the target object. 4. The product is the ideal selection for electrician and maintenance personnel and technicians and can be used to find the problem area quickly. 5. Can be used in fields of fire fighting, archaeology, traffic, agriculture, geology, energy, smelting, electronic manufacture, etc.   Specification: Condition: 100% Brand Measurement Model: HT-A2 Display screen: 3.2" full angle TFT display screen Infrared image resolution: 320x240 visible image resolution: 640x480(300,000 pixel) LCD resolution: 320x240 Field angle/focusing length: 56°* 42°/4.0mm Thermal Sensitivity: 0.07℃ Temperature Measurement range: -20℃to 300℃(-4℉ to 572℉) Measurement Accuracy: ±2% / ±2 Emissivity: Adjustable From 0.01 to 1.00 Frame Rate of thermal images: 9Hz Wavelength coverage: 8-14um Focusing mode: Fixed Color palette: Rainbow, iron oxide red, cold color, black & white, white & black Storage medium: Built-in 3G(above 20 thousand image stored) File format: JPG USB: Micro USB 2.0 Power supply: Built-in chargeable 1800 battery working time: 2-3 hours Automatic power-off time: Selectable: 5 minutes/20 minutes/not power off automatically Open response time: 0 minutes Work temperature: 0℃ to 45℃ Storage temperature: -20℃ to 60℃ Relative humidity: < 85%RH Weight: Approx. 425g / 15.0oz Size: Approx. 140 x 80 x 28mm / 5.5 x 3.2 x 1.1in   Package List: 1 x HT-A2 Mobile Phone Thermal Infrared Imager 1 x Hanging Rope Considerations and Safety Maintenance: 1. Don't use the device in explosive, flammable or corrosive environment. 2. The product belongs to accurate electronic and sensitive optical devices. Don't impact and drop it to avoid damage. 3. Don't dismantle and remodel the products. 4. When the product works, there is light sound of clicking every several seconds. This is normal phenomenon that the lens captures images. 5. Please use damp cloth or weak soap to clean the enclosure of the device.Don't use abradant, isopropanol or solvent to clean. Special optical lens cleaner is used to clean the screen.