Yosoo GM328 Lcd Display Transistor Tester ESR Meter Cymometer Square Wave Generator using the latest 2014 version V1.11 software, M328 chip, more features micro-controller uses 8MHz external crystal, measurement accuracy is better. LCD using 12864 LCD screen that can display measured data and graphics. main chip dual in-line with a socket, ideal for electronics enthusiasts upgrade or replace the chip. Current: When 9V voltage, stable operating current of about 20mA.