Hot Wire, Probe Diameter 0.5 in, Probe Type Hot Wire, Relative Humidity Accuracy Not Applicable, Connector Type J-Type, K-Type, Maximum Hot Wire Probe Length 37 in, Minimum Hot Wire Probe Length 11 in, Minimum Temperature Measured 32 Degrees F, Minimum Velocity Measured 40 fpm, Air Velocity Resolution 1 fpm, Maximum Temperature Measured 122 Degrees F, Maximum Velocity Measured 4,921 fpm, Compatible with Manufacturer Model Number R4500SD, SD-4214, Temperature Accuracy +/ 1.5 Degrees