Features: The RT01 relays Tester quickly diagnoses automotive relays conditions with LED indicators (red/green) and automatically test open/close cycles to detect malfunctioning relays, featuring digital voltages display for 11V-25V batteries. Equipped with noncontact measurement, 2.1cm opening antislip silicone coated alligator clip, and universal 4 pin/5 pin socket, this ABS builts analyzers ensures vibration resistant operation during circuit testing. Ideal for automotive technicians, DIY enthusiasts, and electronics repair specialists requiring precise relays diagnostics and battery voltages monitoring in workshops or garages. Streamlines vehicle maintenance tasks – test relays in car/trucks, verifys battery health, or troubleshoot electrical systems using one clicks TEST function with instantly visual result. Its integrated design combines ruggeds ABS housing with color detection mode (4 PIN/5PIN), delivering professional relays analysis without complex equipment setups. Specifications: Component:Metal Size:Approx.14x2.7cm/5.51x1.06inch Features: It can detect the statuses of the 12V-24V battery voltages. It can measure 4 pin/5 pin, and is suitable for a variety of relays. Silicone Clip. Silicone antislip insulated handle, thickened wear-resistant clamping force and strong clamping force without slipping. Package Includes: 1pc Car Battery voltages Detector 2pcs Silicone Clip 1pc Manual note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.