The Thermapen is lightweight, at less than 100 grams including battery and probe. The casing is manufactured from high impact ABS plastic designed to cope with routine day-to-day applications. An auto-power on/off facility turns the instrument on when the probe is in use and automatically off after five minutes, maximising battery life. The surface probe conveniently folds back through 180 degrees into the side of the instrument when not in use, turning the instrument off. Each Thermapen is supplied with a detachable wrist strap, battery and instruction card.