Rotating Vane, Probe Diameter 2.8 in, Probe Type Rotating Vane, Relative Humidity Accuracy Not Applicable, Connector Type J-Type, K-Type, Maximum Hot Wire Probe Length Not Applicable, Minimum Hot Wire Probe Length Not Applicable, Minimum Temperature Measured 32 Degrees F, Minimum Velocity Measured 79 fpm, Air Velocity Resolution 1 fpm, Maximum Temperature Measured 122 Degrees F, Maximum Velocity Measured 5,906 fpm, Compatible with Manufacturer Model Number R4000SD, SD-4207