Features: 100% brand new and high quality Made of high-quality materials, durable The insulation resistance meter outside the box and a circuit with 500V DC and a 50M ohmmeter case. The circuit impedance of the electrical insulation is the insulation value of the 500V DC voltage test. Use the standard position to overlap the pointer with the zero-scale tolerance of the 1mm balance meter, and tilt it 90 degrees to allow an error range of 1mm. Fine workmanship, good performance, easy to use, long service life Product parameters: Model: TN-90A Pointer material: zinc-nickel alloy The direction of the pointer swing: from left to right Pointer length: The distance from the central axis to the needle is 441mm Pointer width: 0.450.05mm Overall size: about 90 * 70 mm Current sensitivity: 1000uA10% Internal DC impedance: 65010% Friction: 1mm Insulation resistance: 50 or more Bulb: 3.0~3.2V 20mA Test environment: temperature: 20degree Celsius5degree Celsius, humidity: 40~85% Package Included: 2 *VU meter