OptiMate Test TS121

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Product Overview

New updated version!

Simple on vehicle 12V battery tester

• Fast, accurate and professional on-vehicle testing of 12V batteries and charging systems. 

• Weak automotive batteries and charging system anomalies are identified in seconds 

• Test without disassembly: Fast, clean, easy 


If you don't have a multimeter or are unsure how to use one, this is the perfect charging stystem tester for you. No technical knowledge is required!

Use TestMate Mini to test your battery on vehicle and also check your charging system.

1 Simply attach the battery clips to your battery to measure rest voltage.

2 Crank the engine over to see cranking voltage.

3 Run engine to see charging voltage.


Delivered with battery clips and can be connected to your O1 SAE battery lead.

Click links below for demo of display results

GOOD Battery. GOOD charging system

WORN battery. GOOD charging system

MODIFIED ENGINE. (increased compression)

UNDERCHARGED (Good?) Battery.

NEGLECTED Battery. Good charging system

Product Videos


(3 reviews) Write a Review

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  • 5
    O.T TS121

    Posted by Marc on 16th Apr 2021

    very useful and so easy to use! highly recommended!!!

  • 5
    Optimate test TS121

    Posted by John Dunnington on 16th Apr 2021

    So simple to use, and records the cranking voltage, easy for customers to see and understand.

  • 4
    Battery Tester

    Posted by Paul from DUBBO NSW on 24th Jun 2014

    This is a great product for testing the state of charge for your auto batteries,easy to use and accurate. Excellent!!!