Constant-temperature Models 6331, 7321, 7341, 7381 deep-well compact baths cover temperatures from -80 to +300°C, with ±0.005 to ±0.015°C stability, and ±0.007°C uniformity. Thermometer and temperature sensor calibration is enabled by 18 in. depth in 14 x 31 in. footprint. Baths accommodate 4.2 gal of fluid and calibrate liquid-in-glass, SPRTS, and other long-stem thermometers in batches of 10 or more. Each model comes with RS232 port, Windows-based control software, drain, and overflow reservoir.