The entire assembly of the Model 5623A Freezer Probe is specially sealed to prevent the introduction of moisture when exposed to extremely low temperatures. Designed as a calibration standard, this probe has an accuracy (which includes calibration uncertainty and short-term stability) of ±0.05 °C over its range of –200 °C to 156 °C. Each probe comes with a NISTtraceable certificate of calibration and specific ITS-90 coefficients. The 5623A is available in a 0.25" (6.35 mm) diameter by 6" (125 mm) long Inconel™ sheath. The price of the 5623A is $595. Units ship 15 days ARO.

Hart Scientific, a Fluke company, designs, manufactures, and markets temperature measurement and calibration equipment. The Hart Scientific product line includes primary standards, thermometer readouts and probes, temperature baths, industrial calibrators and software. For more information contact Hart Scientific Inc. at 801-763-1600, visit their Web site at www.hartscientific.com, or e-mail info@hartscientific.com.