The 4000counts is a pocket-sized 3 3/4-digit automatic digital instrument with stable performance, high precision, high reliability, clear reading and overload protection. It is a superior tool and instrument, laboratory, factory, radio enthusiasts and the ideal tool for the family. Features: The 4000counts is a pocket-sized 3 3/4-digit automatic digital instrument with stable performance, high precision, high reliability, clear reading and overload protection. Driven by AAA 1.5V battery, the instrument adopts LCD display and adopts boost power supply. Even at the edge of 2.3V low battery, it can ensure the ultra-high brightness of backlight and flashlight. This watch is easy to carry and is a meter that users like very much. The backlight can be turned on and off automatically after 15 seconds. This series of instruments can be used to measure DC voltage and AC voltage, AC current 600A, resistance, continuity test, frequency measurement and true RMS. It is a superior tool and instrument, laboratory, factory, radio enthusiasts and the ideal tool for the family. Specifications: Material:ABS Color:Blue Red Orange Black(Optional) General Characteristics 1. Display: liquid crystal display (LCD) 2. Maximum display: 4000 (3 3/4) bit automatic polarity display; 3. Measurement method: double integral A/D conversion; 4. Sampling rate: about 3 times per second; 5. Over range display: The highest position shows OL; 6. Low voltage displaysymbol appears 7. Working environment(040)relative humidity80% 8. Power: AAA 1.5V battery Batteries excluded 9. Volume (size): 1706530mm (LWH) 10. Weightabout160gBatteries excluded 1.5V battery 11. Attachment: One instruction manual, one outer packaging box, one pair of test leads, Thermocouple, Portable storage bag Functional parameters DC voltage DCV :yes AC voltage ACV :yes AC current ACA :yes Capacitance measurement :yes Resistor / On-Off Test :yes Diode measurement:yesDiode forward voltage drop. Forward DC current is about 1mA, open circuit voltage is about 3V Buzzer:yes The buzzer sounds long and the resistance of the test is less than (5020) . auto recognition AUTO temperature measurement :yes Frequency :yes NCV :yes Zero line / Fire line test :yes Full unit symbol :yes Backlight manual/Auto off :yes True RMS measurement :yes Flashlight lighting :yes HOLD :yes Technical Specifications DC voltage (DCV):4V-40V-400V-600V (0.5%+3) AC voltage (ACV): 4V-40V-400V-600V (1%+3) AC current(ACA):0.1A-4A-40A-400A-600A (2.5%+8) Resistance: 4k-40k-400k-4M-40M (0.5%+3) Frequency measurement: 4Hz-40Hz-400Hz-4kHz-40kHz-400kHz-1MHz (0.1%+2) Capacitance measurement:4nF-40nF-400nF-4F-40F-400F-4mF (2%+5) temperature measurement : -30~1000 / 22~1832 (2.5%+5) Notes: 1. When measuring voltage, please do not input the limit voltage exceeding the effective value of DC 1000V or AC 750V; The voltage below 2.36V is a safe voltage. When measuring higher than 36V DC and 25V AC voltage, check whether the test leads are in reliable contact, are connected correctly, and are well insulated to avoid electric shock; 3. When changing functions and ranges, the test leads should leave the test point.. Package List: 1 *ANENG ST205 Clamp Meter 1 * English User Manual 1 *Outer Packaging Box 1 * Pair of Test Leads 1 * Portable Storage Bag