Gressco | To ensure that individuals entering a location are not running a high temperature, Gressco introduces our new infrared temperature sensor/detector. It provides alerts when within 1 second. The system uses an advanced algorithm for detecting and calculating heat signatures. Based on technology developed in Germany, the highly accurate sensor measures with a tolerance of +/- 0.5 degrees Fahrenheit (+/- 0.3 degrees Celsius). Tablets also come with a 2 year warranty.