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. The instrument is powered by an AAA 1.5V battery and uses an LCD display with a boost supply. Even on the edge of a low 2.3V battery, it ensures ultra-high brightness of backlights and flashlights. This watch is easy to carry and is a very favorite instrument for users. 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 an excellent tool for instruments and instruments, laboratories, factories, radio enthusiasts and families. Specifications: Condition:100% Brand New Material: Plastic Color: Red, Blue, Black, Orange(Optional) Display: liquid crystal display (LCD) Maximum display: 4000 (3 3/4) bit automatic polarity display Measurement method: double integral A/D conversion Sampling rate: about 3 times per second Over range display: The highest position shows "OL" Low voltage display: symbol appears Working environment: (0-40), relative humidity80% Power: AAA 1.5V battery Not included Volume (size): Approx.170*65*30mm / 6.7*2.6*1.2in(L*W*H) Weight: Approx.160gBatteries excluded 1.5V battery Package List: 1*Instruction Manual 1*Pair Test Pens 1*Portable Storage Bag 1*Lanyard 1*Multimeter Note: 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.