Has a temperature range of 35 to 350 degrees Celsius, and it reaches its maximum temperature in 12 minutes. At six pounds, it's small enough to easily carry in one hand. It's truly a unique innovation in dry-wells. The unit has a stability of plus or minus0.05 degrees Celsius or better and a uniformity of at least 0.4 degrees Celsius in the largest-diameter wells and 0.1 degrees Celsius in the smaller wells. Despite its small size, this unit performs. Use the display, calibrated to plus or minus0.5 degrees Celsius, as your reference, or use an external thermometer for maximum calibration accuracy. With three removable inserts to choose from, it is as versatile as it is fast. Dry-Well, Mid-Range Field W/3140-6, 115V.