What is it? With the iHealth PT3 No-Touch Forehead Thermometer you can measure the temperature of the whole family hygienically, painlessly and with great accuracy. Easy to use, accurate, just 1 second An ultra-sensitive infrared sensor that measures the infrared energy emitted by the forehead and collects more than 100 data points per second. A distance sensor that ensures that measurements are taken no more than 3 cm from the forehead to avoid errors. An environmental temperature sensor that detects the real-time variations in environmental temperature to reduce the impact and compensates to ensure measurement accuracy. All this is done with a single button, in just 1 second.