Comark KM400AP Allergen Pocket Thermometer is designed to keep customers with certain allergies safe. The waterproof thermometer is purple to ensure that it is easily identified from other thermometers. Thin tip is designed to fast response times and will read temperatures of -58F to 400F. Operates on 1.5 volt LR44 battery that is included. Comes with a storage sheath with a clip. - Digital - Purple - NSF - Stem Length 3 in