Features: 2013 the latest version of the software. Microcontroller using 8MHz external crystal, for better measurement accuracy. Key resistance using a thousandth of metal film resistors, the remaining a hundredth metal film resistors. Requires 9V battery(not included),please unscrew the back case and fit the battery. LCD backlit LCD screen with low power consumption, compared with the whole power https://elecena.pl/product/23423833/transistor-tester 2023-05-10 https://elecena.pl/product/23423833/transistor-tester 2025-07-09