VOL-880 Digital Voltmeter Ammeter Ohmmeter Multimeter Volt AC DC Tester CMOS integrated circuit and dual slope A/D conversion, auto zero and select polarity 70 x 40mm big lcd screen, word size up to 25mm. It will auto turn off after starting up 25 minutes High reliable measure range and 32 gears are more effective to avoid false operati The best display visual angle is approx 70