Item Type: Battery Tester Material: PC, ABS, silica gel and copper wire Size: Approx. 255 x 108 x 45mm/10.0 x 4.3 x 1.8in Applications: Suitable for 12/24V automotive batteries (Regular, AGM, GEL), automotive start system and charging system test. Suitable for CCA, DIN, IEC, EN, JIS Standard batteries and unknown standard batteries. Voltage Range: DC 9 - 30V Working Temperature: 0 - 40 Working Humidity: 20% - 80% Language: English(US). Chinese (Simplified) Screen Parameter: LCD, LED backlight Resolution: 128 x 64 Printer Paper: Thermal printing paper, approx. 57(wide)x40(diameter)mm/2.2 x 1.6in Case Material: Germany PC, ABS plastic material TPE Rubber Cover Wire Characteristics: Very fine copper wire, silicone insulation, especially soft, prevent breaking, length approx. 1000mm/39.4in Function: 1. The batteries will gradually age over time after being made. As the battery electrode plate surface age and produces sulfides, the batteries can not undergo the chemical reactions effectively, this is the main reason the most batteries cannot continue to be used. At this time, the internal resistance of the batteries increases. The older batteries, the greater the internal resistance. By accurately measuring the value of internal resistance, you can determine the aged of the batteries. Currently, conductance method is the most advanced method to measure the internal resistance of the batteries. 2. It has a proven result of electric conductance testand 1/2 CCA discharging measurement test can be identical. Given result fully shows the accuracy of this tester. During operation, avoiding large current to discharge the battery can protect the battery from possible damages and heat generation. This allow the machine operator perform tests several times within a short time period. In recent years, the conductance method to measure the internal resistance of a battery is being widely used around the world. Package List 1 x 12V/24V Battery Tester 1 x Standby Printing Paper 1 x User Manual 1 x Storage Tool Box 1Adopting the conductivity method test principle, no need for high current discharge, and the battery has no heat and no damage. 2Three functions include battery test, startup system test, power generation charging system test, simple operation, easy to carry and store. 3The characteristics of the TPE rubber sheathed wire include extremely thin copper wire, silicone insulation, particularly soft, prevent breakage, and a length of approx. 1000mm/39.4in. 4Suitable for 12/24V automotive batteries, common liquid rich type (WET), maintenance free (MF), AGM, EFB start and stop, GEL, Marine, etc. 5Suitable for automotive start system and charging system test and CCA, DIN, IEC, EN, JIS Standard batteries and unknown standard batteries. 6The input voltage is DC 9 30V. The housing material is made of German PC and ABS plastic materials.