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Introduction: This is a digital multimeter across automated using a double whole style that converts as a core. They can be used for battery-powered ac/DC voltage, AC/DC current, resistance, capacity, diodes and continuous inspection, temperature, frequency, etc. These are the ideal tools for use in LAV, factories, radio fans and family with features of large LCD display for overload protection and clear reading. Features: Large LCD Display, Maximum Display: 8000 Count (ZT301) / 999 Count (ZT302) / Polarity Identification / Measurement Mode: Dual integration style A / D conversion, Sample rate: 3 times per second, Over range display: OL / Low voltage display / Operating environment: 0 - 40 degrees, relative humidity <; 80% Size: 85 x 160% x 1.3 inches (32 mm). Auto range True RMS measurement Backlight display Data retention Polarity automatic recognition Low voltage display 10A large current measurement Massachusetts level low current measurement Automatic shut-off Main measurement : AC / DC voltage, AC / DC current, resistance, capacitance, Diode/measure off, frequency and duty ratio measurement. Specifications: (1) Frequency 100/1000/10K / 100K / 10M (±0.1%±2) Capacitance: 10nF (±5.0%±20), 100nF / 1μF / 10μF / 100uF / 100uF (±2.0%±5), 0MF (±5 .0%±5)(3) DC Voltage: 800mV (±1.0%±10), 8V/80V/800V/1000V(±0.5%±3), (4) AC Voltage: 800mV (±3.0%±3), 8V/80V/800V/750V (±1.0%) ±3), (5. DC current: 800uA / 8000uA (±1.5%±3), 80mA/ 800mA(±1.5%±3), 10A(±1.5%±3), (6) Current AC: 800uA / 8000uA (±1.5%±3), 80mA/800mA. 1.5%± 3) 10A(±1.5%±3)(7) Resistance: 800(±0.5%±3), 8K / 80K / 800K / 8M (±0.5%±2), 80M (±1.5%±3)(8) Temperature: <; 400±C (1.0%±5), over 400¡±C±(1.5%±15)<; 752±(1.0%±5) or above 752°F (1.5%±15) (9) Stock Ratio: 1% to 99% (±1%) (8) How to Measure: Dual integration A / D converter (9) Display: OL (10) Working environment: 0 to 40 °C, relative humidity & L