4
Tester Components
2.1 Tool Description
1. LCD DISPLAY
-- Indicates test results. It is a backlit 2-line display with 8
characters on each line.
2. ENTER BUTTON
--
Confirms a selection (or action) from a menu list, or
returns to the main menu.
3. SCROLL BUTTON
--
Scrolls through menu items or cancel an operation.
4. CLIPS
--
Connects to the battery terminals Red with + and Black to -.
2.2 Battery Internal Resistance Explanation
IR (Internal Resistance) is an important factor when judging battery capability.
When the internal resistance of a battery exceeds a certain limit, the engine can't be started.
The normal IR of car batteries should be less than 10mΩ,
but there will be slight differences
between manufacturers.
The lower the IR the greater CCA capability ie, for the same kind batteries, the lower the IR, the
healthier the battery is (Except for a short circuit).
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