Hot Wire, Probe Diameter 0.31 in, Probe Type Hot Wire, Relative Humidity Accuracy +/-3 Percent, Includes NIST Certificate, Maximum Hot Wire Probe Length 39 in, Minimum Hot Wire Probe Length 9 in, Minimum Relative Humidity Measured 0 Percent, Minimum Temperature Measured -40 Degrees F, Maximum Relative Humidity Measured 95 Percent, Maximum Temperature Measured 250 Degrees F, Compatible with Grainger Part Number 3ATR7, Compatible with Manufacturer Model Number EBT720, Compatible with Series EBT