The Pro-Temp Commercial Thermometer is the last-word in accuracy. With all the features you'd expect in a commercial-grade thermometer, You're assured an accurate reading every time to 1 degree C. The Pro-Temp is water and dust reisistant, as well as shock-reistant to multiple drops on a concrete floor-a must in a fast-paced commercial kitchen environment. Instant measurement of temperatures from -40F to 450F within three seconds. Reverse LCD, auto on/off features, handy cooking chart and the ability to fold into a compact unit-we've anticipated the demands of the professional chef. Each unit has factory certification - NSF approved for professional use, certificate included guarantees performance and accuracy to NIST standards. Three AAA batteries included.