Features:  Wider Ranges: This tester has a measuring ranges of 0.01mΩ~200Ω. Compared with traditional battery internal resistance testers, it has a wider measuring ranges and a wider ranges of applications.  Low Resistance Measurement Function: Short press the power button to turn on the low resistance function, and measure the internal resistance of 0.30-0.50 milliohms.  Various Battery Tests: This tester can measure lithium ion, lithium polymer, lithium iron phosphate, alkaline, dry battery, nickel metal hydride, nickel cadmium, button battery, etc.  Portable Size: This battery internal resistance tester with portable size and easy to carry, you can share this product with your friends and families.  Built-in Battery: This tester has a built-in large capacity lithium battery to supplys power, you can recharge it in time when the battery voltage is under 3.5V.  Screen Backlight&Automatic Shutdown: The backlight of screen is adjustable and you can setting the automatic shutdown time according to your needs.  Voltage&Internal Resistance Display: The voltage and internal resistance are displayed on the screen, and the ranges can be manually and automatically switched.    Specifications:  Material: plastics  Measuring ranges: 0.01mΩ~200Ω  Resolution: 0.01mΩ  Battery: 1 * lithium battery, 400mAh (included)  20mΩ:  Minimum resolution: 0.01mΩ  Accuracy: 0.7%+7  200mΩ:  Minimum resolution: 0.1mΩ  Accuracy: 0.5%+5  2Ω:  Minimum resolution: 1mΩ  Accuracy: 0.5%+5  20Ω:  Minimum resolution: 10mΩ  Accuracy: 0.5%+5  200Ω:  Minimum resolution: 0.1Ω  Accuracy: 0.6%+5  Voltage measuring:  Ranges: ±6V  Minimum resolution: 0.001V  Accuracy: 0.1%+5  Ranges: ±45V  Minimum resolution: 0.01V  Accuracy: 0.1%+5  Item size: 135 * 68 * 25mm / 5.3 * 2.7 * 1.0in  Item weight: 148g / 5.2ounce  Package size: 220 * 130 * 77mm / 8.7 * 5.1 * 3.0in  Package weight: 379g / 13.4ounce    Note: Please do not test the battery over 30v, it will burn the instrument.    Packing list:  1 * Battery Internal Resistance Tester  1 * Testing Clip  1 * Pair Probe  1 * Four-wire Rack