The ST680 Series is a handheld infrared thermometer developed by Calex. It is built with high quality construction with fast sampling time. This unit features a built-in laser pointer to improve aim, backlit LCD display, and °C/°F switchable. It also integrates an auto-hold and power off, adjustable emissivity, and adjustable high and low alarms. It has a temperature range of -50°C to 1000°C and a resolution of 0.1°C. This device also offer a 50:1 field of view, which helps to minimize errors through producing a small diameter measurement area. In addition, it operates in ambient temperatures from 0°C to 50°C and are powered by a standard PP3, 9V .battery