Overview

The Uni-T UT677A is a professional-grade battery internal resistance tester specifically designed for measuring the health and performance of lead-acid and lithium batteries. By utilizing a 4-terminal AC measurement method, this device eliminates contact resistance errors, providing highly accurate readings of internal resistance, voltage, and temperature simultaneously. Whether you are performing routine maintenance on UPS systems or diagnosing automotive battery health, the UT677A delivers fast, reliable results in just 200 milliseconds.

Equipped with a vivid 3.5-inch colour display, the unit offers a clear interface for real-time monitoring and data assessment. It includes a judgment function that provides instant PASS, WARNING, or FAIL indicators based on pre-set thresholds, making it an indispensable tool for rapid onsite diagnostics and large-scale battery bank inspections.

Why It Matters

Battery failure often stems from increased internal resistance that isn't always visible through voltage checks alone. This tester provides a comprehensive health check, allowing technicians to identify failing cells before they cause system outages, saving time and preventing costly equipment damage in critical power environments.

What's Included

• ✓ Uni-T UT677A Instrument
• ✓ Kelvin Clip Test Leads
• ✓ USB Communication Cable
• ✓ Rechargeable 3.7V Lithium Battery
• ✓ Power Adapter
• ✓ English User Manual
• ✓ 12-Month Warranty

Features & Benefits

• High Precision: Measures internal resistance from 0.000mΩ to 3.000Ω with a resolution as low as 1μΩ.
• Broad Voltage Range: Capable of testing battery voltages from 0.000V up to ±71.00V.
• Temperature Monitoring: Integrated probe measures ambient or battery temperature from -10.0°C to 60.0°C.
• Advanced Connectivity: Features Bluetooth app support for Android devices and a USB interface for PC data management.
• Massive Data Storage: Internal memory stores up to 5,000 test results, perfect for long-term tracking and reporting.
• Efficiency: Rapid 200ms response time ensures you can test entire battery strings in minutes.

Applications

• ✓ UPS and backup power system maintenance.
• ✓ Automotive and electric vehicle battery diagnostics.
• ✓ Solar storage array inspections.
• ✓ Battery production and quality control labs.
• ✓ Capacitor and high-current connection testing.

Tradie Pro Tip: Always ensure your Kelvin clip connections are clean and clamped directly onto the battery terminals, rather than the bolts or cables. This prevents false high resistance readings caused by oxidation or loose mechanical connections.

Pair With

• ✓ Insulated Hand Tools
• ✓ Industrial Multimeters
• ✓ Protective Tool Cases

Keep Your Space Clean

Ensure your critical systems never lose power by identifying battery degradation early. Order your Uni-T UT677A today and take the guesswork out of battery maintenance. Shop now at HVAC Shop.