This product is suitable for quick test of wire length, resistivity, and quick judgment of the quality of power cords of motors and transformers. Portable size and powerful functions, this tool is an indispensable in your daily work, if you need it, come and have a try! Features: This product is suitable for quick test of wire length, resistivity, and quick judgment of the quality of power cords of motors and transformers. Portable size and easy to carry, you can take it with you to anywhere you want to use. Although this measuring meter cannot test batteries, it can test resistances such as transformers, motors, and large inductance inductors. The higher accuracy can be used to detect the resistance of precisions current-sense resistors. Easy to use: Intercept a certain length of wire, calculate the cross-sectional area by measuring the diameter, enter the instrument detection mode and enter the corresponding parameters, and then measure the wire resistance to calculate the resistivity. The resistivity can determine whether the wire material is pure copper. This product can be used to detect whether the transformer winding is qualified. Open the upper and lower limits in the normal mode, and input the upper and lower limits of resistance to test the resistance of the transformer winding. Specifications: Material: plastics Resolution: 120000 Protections fusing current: 0.5A Working temperature: 10 ~40 Storage temperature: -20-60 Battery: 1 * lithium battery, 2000mAh (included) Package size: 120 * 60 * 40mm / 4.7 * 2.4 * 1.6in Package weight: 300g / 10.6ounce Note: This YR2050 Can't Measuring battery internal resistance . It is strictly prohibited to measure any live parts, such as AC / direct current voltage input to the test interface, which may damage the instrument. Packing list: 1 * Tester 1 * Test Clip