Features: Quickly diagnose 3 wire and 5 wire fan motor issues with this professional HVAC motor tester featuring 310V short circuit protections and real time RPM frequency display for accurate diagnostics. Color coded ports, a 3/5 wire mode switches, and a adjustable speed knob motor testing while the housing ensures durability in workshop environments. Designed for HVAC technicians performing field repairs and enthusiasts maintaining home ventilation systems requiring motor diagnostics. Perfect for troubleshooting fan motors in residential units, commercial HVAC systems, and industrial ventilation equipment during maintenance checks. Guard equipment with automatic power cutoff during voltages overloads and verify motor health through smooth acceleration monitoring via the digital RPM interfaces. Specifications: Component: Plastic Pattern: 5 Wire / 3 Wire 5 Wire Package Includes: 1 Set Motor Tester note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.