Since 1947 they have been in manufacturing and marketing of battery chargers, portable power sources, inverters/converters, battery testers, 12V accessories, and welding equipment.
Schumacher Electric – Battery Testing – https://www.batterychargers.com/
Schumacher Electric started originally by designing and producing custom-built transformers for the electronic industry.
PST-900X ProSeries Battery Tester with a Printer
This is 3 Testers Battery, Charging and Starting in one instrument. Easy to use with 3 Button Operation and used for testing 6 & 12 volt batteries.
It is also helpful in evaluating 12 & 24 volt charging systems. It has a 16 Character LCD with Adjustable Backlighting. Includes Case, Clamps, Batteries.
Before you start testing – Precautions – (from the user manual)
Be sure the area around the battery is well ventilated while the battery is being tested.
Clean the battery terminals. Be careful to keep corrosion from coming in contact with your eyes.
Inspect the battery for a cracked or broken case or cover. If the battery is damaged, do not use the tester.
If the battery is not a sealed maintenance free battery, check the level of each cell and if necessary, add distilled water until the battery acid reaches the level specified by the manufacturer. This helps purge excessive gas from the cells. Do not overfill.
If it is necessary to remove the battery from the vehicle to test it, always remove the ground terminal from the battery first. Make sure all accessories in the vehicle are off to ensure you do not cause any arcing.
Schumacher Electric Corporation
801 Business Center Drive, Mount Prospect, IL 60056, USA.