6. Data holding function, low power indication, automatic power off. Product parameters: Optional models: ST181, ST182, ST183 DC voltage (ST181, ST182): 400mV~600V AC voltage (ST181, ST182): 4V~600V AC current (ST181, ST182): 40A~400A Capacitance (ST181, ST182): 4nF~4mF Temperature (ST182) - 20 ℃~1000 ℃, 32 ℉~1382 ℉ Hertz/HZ (ST181, ST182): 4hz~4Mhz Zero live wire (ST181, ST182, ): √ NCV(ST181,ST182,):√ On off buzzer (ST181, ST182, ): √ Backlit bright screen (ST181, ST182, ): √ Data retention (ST181, ST182, ): √ Maximum count: (ST181, ST182): 4000 counts, (ST183) 6000 counts Battery: AAA * 2/7 battery Package list: