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Specification: Monitor: 4000 Over range indication: LCD will show "OL" Battery type: 3 x 1.5V AAA (included) Dimensions: 5.78in (L) × 2.79mm (W) x1.77in (H) Weight: about 220g (without battery) DC voltage range: 0.8V-600V DC voltage accuracy: ± (0.8% + 5) AC voltage range: 1V-600V (50-60HZ) AC voltage accuracy: ± (1.0% + 5) Current range: 0.001A-10A Current accuracy: ± (2.0% + 5) Resistance range: 0.1-40MΩ Resistance accuracy: ± (1.0% + 5) Frequency range: 10Hz-2000Hz Frequency accuracy: ± (2.0% + 5) Auto power off √ Backlight √ Illumination √ Diode √ Buzzer indicator √ NCV √ NCV indicator √ Firewire discrimination √ True effective value √ Undervoltage indicator √ Note before using: 1. To avoid erroneous readings and cause electric shock or personal injury, when the battery low voltage symbol appears, the battery should be replaced as soon as possible. 2. To prevent the rabbit from electric shock or personal injury, before opening the battery cover to replace the new battery, you must turn it off and verify that the test pen is disconnected from the circuit under test. 3. Do not measure any AC or DC voltage greater than 600 V to avoid electric shock or damage to the instrument. Security warning 1. To avoid erroneous readings and cause electric shock or personal injury, when the battery low voltage symbol appears, the battery should be replaced as soon as possible. 2. To prevent from electric shock or personal injury, before opening the battery cover to replace the new battery, you must turn it off and verify that the test pen is disconnected from the circuit under test. 3. Do not measure any AC or DC voltage greater than 600 V to avoid electric shock or damage to the instrument.