PRO Battery Tester Battery testing with built-in printer, for workshop CTEK's PRO Battery Tester gives you a quick, easy and accurate battery test. The built-in printer provides printouts of the results that you can show to the customer The CTEK PRO Battery Tester gives you quick, easy and accurate battery testing in seconds. It has a built-in printer which means you can provide a printout of the results to your customer and talk to them directly about preventative maintenance for their battery or electrical system. The patented PRO Battery Tester is well-matched to various types of 12V batteries (standard/wet/open, AGM and GEL) and electrical systems in cars and light trucks. *By request/order.