Test automotive relays quickly and accurately with the ANENG RT01 Digital Relay Tester. Designed for 4-pin and 5-pin relays, this compact diagnostic tool features battery voltage detection, digital LED display, and no internal battery requirement. Ideal for cars, motorcycles, trucks, garages, mechanics, and DIY electrical troubleshooting. Easy to use, portable, and reliable for fast relay diagnostics and battery testing. ANENG RT01, Digital Relay Tester, 4 Pin Relay Tester, 5 Pin Relay Tester, Battery Voltage Detector, Automotive Relay Tester, Car Electrical Diagnostic Tool, Relay Detection Tool, Auto Repair Equipment, Battery Voltage Tester, Vehicle Relay Checker, Garage Tools, Mechanic Tools, DIY Electronics Tester, ANENG Relay Detector.