Multipurpose Measure Gauge: this meter can be used to measure AC/DC voltage, DC current, resistance, diode and buzzer, temperature(only for model S18C), infrared signal detection(only for model S18B). Safety Operation: the circuit design is safe and reliable, with overvoltage protection and complies with the standard 600V CAT II and pollution grade 2. Auto Power-off: the meter will automatic shut down if there is no operation in 15 minutes. and the backlight/flashlight will shut off in 15s/30s of no operating. Clearly Digital Display: 2.1-inch LCD screen equipped with a backlight, allowing you to read the measurement display in a dark place. The analog display can show the variation tends of measurements, 1999 counts display makes the reading more accurate. Accurate Measurement: embedded with a special IC up to 2000 counts, this IC is composed of high-precision A/D converter with high-speed digital processor, the meter features of high resolution, fast operation speed, complete software calibration, no change in long-term use in accuracy.