Digital Food Service Thermometer, Food Safety, Temp. Range (F) -40 Degrees to 450 Degrees , Temp. Range (C) -40 Degrees to 230 Degrees Dial Size 1-1/2 In., Stem Length 3-1/2 In., Standards NSF, Diameter 1.5mm, Length 6 In., Stem Material Stainless Steel, Case Material PlasticDisplay LCDFeatures Hold Feature for Easy Reading, Waterproof, On/Off Switch, One Second Updates, Anti Microbial CaseIncludes 1.5V Battery Thermometers and TimersHandheld Thermometers3NZR8 features 3-pt. calibration for +/- 1% accuracy at any point. 3NZR9 includes memory recall, on/off switch, and a battery. 3NZT1, 3NZT2, 3NZT3 feature on/off switch with auto shut-off and gives 1-sec. updates. Battery included. Waterproof and NSF Certified. 3NZT1 and 3NZT3 can be recallibrated with HACCP requirements. 3NZT4 is recalibratable and has a 2-stage off button with timer. Includes battery. 3NZT5 is self-calibrating and gives accuracy 0.5 F in HACCP temperature ranges and 0.1 F/0.1 C in resolution. Includes battery. NSF Certified.