The 3-in-1 tester is combined with the function of multimeter, test pen, voltage meter, can measure DC voltage, AC voltage, frequency, resistance, continuity, V~Alert, zero & fire line judgement, and more, which is suitable for electrical device maintenance. Features: Multifunctional Universal Meter: including the functions of measuring DC voltage, AC voltage, frequency, resistance, continuity, V~Alert, and zero & fire line judgement. HD LCD Digital Display: 4 digits with maximum 2000 value display, LCD full display voltage, frequency, and analog bar simultaneously. 8 LED Indicators: 8 LED indicators in 3 colors make it very easy to judge detected voltage strength Safety Operation: meet with CAT II 400V over-voltage standard, double insulation protection(II level), and full measuring range overload protection. Socket Live Wire Distinguish: non-contact AC voltage and live wire detection, with buzzer sounds and LED lights to indicate. Compact Thin Body Design: thin body design with compact portable size, which enhance the comfort of operation and convenient to carry around, the multimeter is suitable for handling the automotive and household electrical problems. Other Features: built-in LED flashlight for auxiliary lighting, large HD LCD display for clear reading, 3 minutes auto-off for saving power, data hold for conveniently read and record, and has low battery indication to remind you replace the battery. Specifications: Model: S1 / S1CL (Optional) Screen Display: S1: Black Words on White / S1CL: White Words on Black Automatic measuring range Full measuring range overload protection. DC Voltage: 500V±(0.8%+3), 0.1V resolution AC Voltage: 500V±(1.2%+3), 0.1V resolution Resistance: 10M±(1.2%+3), 1 resolution Frequency: 1000Hz±(2.0%+3), 0.1Hz resolution Work height: maximum 2000m Display: LCD Maximum display value: 2000 digits. Polarity indication: Self-indicating,"-"means Negative polarity. Over-range display : "0L" or "-0L" Sampling time : The meter figures show about 0.4 seconds Unit display: Function and battery unit display. Automatic Power off time : 3 minutes Operational power : 1 . 5V AAA battery.(not included) Battery low voltage indication : LCD display symbol. Temperature coefficient : Less than 0.1 x Accuracy / Operational temperature and humidity : 0-40 / 32-104, 45 % -80 % RH Storage temperature and humidity : -10-60 / -4-140, 45 % -80 % RH Material: ABS Item Size: 150 * 39 * 18 mm / 5.91 * 1.54 * 0.71 inch Item Weight: 65g / 2.29oz Package Size: 18 * 8.3 * 4.2cm / 7.09 * 3.27 * 1.65 inch Package Weight: 215g / 7.58oz Package List: 1 * Multimeter 1 Pair * Test Pen 1 * Cloth Bag 1 * Chinese and English Manual