About this product

Professional-Grade Diagnostics at Your Fingertips

Are you a mechanic, fleet manager, or RV/boat owner in need of a reliable diagnostic tool? The Konnwei KW371 2-in-1 Battery & Relay Tester is your all-in-one solution for automotive electrical system health. It combines precise battery testing with relay diagnosis, eliminating the need for multiple devices.

Relay Testing Made Simple

Diagnose 4-pin and 5-pin relays effortlessly. The built-in relay tester quickly identifies coil failures and contact wear without dismantling the fuse box. Save hours of troubleshooting and get back on the road faster.

Universal Battery Compatibility

Unlike testers limited to 12V, the KW371 covers 6V (motorcycles), 12V (cars, SUVs), and 24V (trucks, boats). It accurately analyzes various battery types—lead-acid, AGM (flat/spiral), gel, EFB, and lithium—with a capacity range of 10-2000 CCA and 5-220 Ah. Support for global standards (CCA, JIS, EN, DIN, SAE, IEC, GB) ensures it works with vehicles from around the world.

Deep System Analysis

Perform three comprehensive tests to get a complete picture of your vehicle's electrical health: