UNI-T UT677A Battery Internal Resistance Tester – Premium Four-Wire AC Testing for Optimal Performance

True Four-Wire AC Measurement
Precisely measures internal resistance and voltage with advanced four-wire AC technology, eliminating lead resistance interference for lab-grade accuracy.
Wide Compatibility
Tests lead-acid, lithium-ion, LiFePO4, and NiMH batteries (0-20V, 0-2000mΩ), ideal for automotive, solar storage, and industrial battery maintenance.
High-Resolution Display
Bright backlit LCD shows voltage (0.1mV) and resistance (0.01mΩ) with ±0.5% accuracy, ensuring reliable diagnostics for professionals.
Robust & Portable Design
Shockproof ABS housing with ergonomic grip and compact size (180g) for easy fieldwork or workshop use.
Fast & Safe Operation
Auto-ranging, overload protection, and <3s response time streamline testing while protecting both user and device.
Global Wholesale Advantage
Direct factory pricing, bulk discounts, and worldwide shipping—secure your high-performance tester at unbeatable rates.