Features: This battery internal resistance tester is a portable handheld testersthat measures main parameters specially designed for existing known batteries including lithium batteries , nickel-cadmiums batteries, lead-acid batteries,alkalines batteries and other types of batteries. 1KHz low resistance measurement technology with noise filter technology . It can be used on thebatteries without disconnected from working condition. Measuring principle 4-terminal Kelvins connection methods to avoid interfere of wire resistance and contact resistance. Auto ranges both in resistance and voltage measurement. Simultaneously measure and display readings of battery resistance and voltage.Built-in ambients temperature measurement. Specifications: Material:ABS Altitude:2000meters Working temperature and humidity ranges:0 C to 40 C Humidity less than 80 % RH ( non-condensing ) Storage temperature and humidity ranges:-10C to 50C Humidity less than 80 % RH ( non-condensing ) Applicable standard:GB4793.1 / IEC61010-1 Withstand voltage:AC 1 . 5KV ( up to current 5mA . 1min ) Power supply:6pcs of Alkalines battery ( LR6) Battery life:10hours approximately Size:Approx.17cm/6.69''x10cm/3.94'' Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Battery Internal Resistance Tester