Dedicate this thermometer to a specific test. Provides continuous monitoring for over a year. To provide for even longer battery life, the unit has an on/off switch. Thermometer is switchable between degree F/ degree C. Wide range of -58 to 302 degree F/-50 to 150 degree C covers 90 percent of lab temperature measurements. To achieve this temperature range with equivalent precision would require over 150 mercury thermometers. Enjoy digital resolution of 0.1 degree from -20 to 200 degree (1 degree outside this range). Accuracy is +/-1 degree C between -20 and 100 degree C. Ultra model accuracy is +/-0.3 degree C at tested points. Readings are updated every second. Smooth, stainless-steel probe is perfect for gunky and viscous solutions. Probe is resistant to most laboratory chemicals. Its piercing tip makes it perfect for measuring temperatures of semisolids. Plastic and stainless-steel construction (no glass or mercury) makes it safer than mercury thermometers. To assure accuracy an individually serial-numbered Traceable Certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). Extra-large, easy-to-read display is 3/8-inch-high. Bright LCD is easier to read than eye straining guesses at pointers or mercury positions. Stem length is 5-1/4 inches, stem diameter is 5/32 inch, and top diameter is 2-1/8 inches. Overall length is 6-1/2 inches. Weight is 1 ounce. Supplied with silver-oxide battery and Traceable Certificate.