For work in the temperature range of –10°C to 122°C, our Model 9102S dry-well is another first in the industry, featuring stability to ±0.05°C. This dry-well is only four inches high and six inches wide, achieves temperatures as low as –10°C, includes a NIST-traceable calibration, and is stable to ±0.05°C. The Model 9102S is excellent for dial gauges, digital thermometers, bulb switches, and other sensors that need calibration below ambient. The 9102S has two wells so you can use one for a reference thermometer to increase accuracy. Both wells are 1/2 inch in diameter, and each has inserts available for almost any sensor size. The 9102S also has a battery pack option that gives you approximately four hours of field use when AC power is unavailable.