About this item

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: Battery Health: Measures SOH, SOC, internal resistance, and voltage. Starting System: Checks cranking voltage and time to detect starter issues. Charging System: Detects ripples and load issues to verify alternator performance. Immediately determine whether the problem lies in the battery, alternator, or starter—no guesswork involved. Designed for Every User With a graphical waveform display and real-time voltage monitoring, results are clear and easy to interpret: Battery Good, Replace, Bad, or Charge & Retest. Polarity reverse protection makes it safe for beginners, while 18 language options make it user-friendly for a global audience. Built to Last, Ready for Work The KW371 is powered directly by the vehicle battery via durable alligator clips, so there's no internal battery to recharge. USB connectivity allows for firmware updates and report printing on Windows PCs. Whether you're a professional mechanic or a vehicle owner who values reliable diagnostics, the Konnwei KW371 is the ultimate tool you need. Returns, Refunds and Replacements Delivery Timeframe Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows: For customers in Victoria, approximately 7-10 working days; For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days; For customers in WA, NT, and TAS, approximately 9-12 working days.