12V Car Battery Tester Fault Diagnosis Tool Internal Resistance Meter 7-220A 3-220AH

This car battery tester is a practical fault diagnosis instrument designed for 12V automotive batteries. It helps you quickly evaluate battery condition by measuring voltage, internal resistance, and capacity, saving time and preventing roadside failure. Whether you're a mechanic or a car owner, accurate data lets you decide whether to recharge or replace the battery. The compact black unit fits easily in a glovebox or tool kit.

Features and Construction

The tester combines multiple measurement functions in one handheld device. Its clear digital display shows real-time readings for voltage, internal resistance, current, temperature, and capacity.

Measurement Capabilities

Voltage measurement covers 6-30V with 0.1V accuracy, suitable for most car batteries. Internal resistance spans 0.1 to 999.9 mΩ at 0.1 mΩ precision, a key indicator of battery health. Current range 7-220A (0.1A accuracy) helps assess starting or charging circuits. Capacity testing from 3 to 220 AH matches common automotive batteries.

Temperature and Power

The unit operates in temperatures from -20°C to 55°C, with temperature measurement accuracy of 25°C. It runs on 12V power supply (10W), drawing directly from the battery under test. Dimensions are compact at 15cm by 6cm by 3cm, making it portable.

Build and Ergonomics

The tester has a durable ABS plastic casing. A simple button interface lets you cycle through modes. The backlit LCD screen provides easy reading in low-light conditions. Supplied in black colour.

Uses and Placement

This tool is designed for automotive workshops, garages, and home mechanics who maintain 12V lead-acid or AGM batteries.

Workshop and Professional Use

Mechanics can quickly diagnose battery health during routine servicing, identifying weak batteries before they fail. The internal resistance measurement helps spot sulphation or cell damage.

Everyday Home Use

Car owners can check battery condition seasonally, especially before winter. The tester helps decide when to recharge or replace, avoiding unnecessary costs.

Benefits and Buying Value

Regular battery testing extends battery life and improves vehicle reliability. This tool provides precise, repeatable measurements without guesswork.

Accurate Diagnosis

With 0.1 mΩ internal resistance resolution and 0.1V voltage accuracy, you get reliable data to make maintenance decisions.

Versatility

Multiple measurement modes (voltage, current, resistance, capacity, temperature) cover most battery-related diagnostics in one device.

Portable and Easy to Use

Small size and simple controls mean you can carry it anywhere. No external power required – it runs directly from the battery being tested.