Features: 1Digital Display: This insulation resistance tester has a large LCD digital display with backlight display function real time data display intuitive and clear. 2Data Lock: This shaker will lock the measurement data after measurement to prevent other interference factors from affecting data changes. 3Alarm Prompt: When some emergencies occur the meter will light up the red alarm light give a buzzer alarm and also have a low battery indicator an over limit prompt a high voltage prompt etc. 4Voltage and Current: This digital ground resistance tester supports external direct current (DC) power supply DC 9V 1.5A. 5Widely Applicable: This digital meter is suitable for insulation resistance measurement AC measurement DC measurement small resistance measurement etc. Specification: Item Type: Insulation Resistance TesterMaterial: ABSGross Weight: 901g / 31.8ozProduct Size: Approx.17.5 x 11.5 x 6.4cm / 6.9 x 4.5 x 2.5inModel: GT5306AApplicable: Suitable for insulation resistance testing of motors cables electromechanical equipment telecommunication equipment power facilities etc.(1) Accuracy: (a% reading and least significant digit)(2) Ensure Accuracy Ambient Temperature: 235(3) Relative Humidity: < 75%Display: 3 1/2 LCD display maximum reading is 1999 Over Limit Indication: only the highest digit will display 1 when the upper limit is exceededSampling Rate: about 3 times per secondAltitude: < 2000mAdditional Temperature Coefficient: 0.15 x specified accuracy per (< 18 or > 28)Use Environment: indoor use pollution level 2Operating Environment: -15 ~ 55 relative humidity < 75%RHStorage Environment: -40 C ~ 60 C relative humidity < 90%RHOverload Protection: 100mA 60V self recovery fuseLow Power Warning: +- is displayed on the screenPower Supply: 6 1.5V AA batteries or external current 9V adaptation (shipped without batteries)Current Consumption: power consumption < 300mW when testing no loadShort Circuit Current: < 1.8mAResistance on off test: 0 ~2K <50 buzzer sound test current: 1mA basic accuracy: (0.8% reading +6 words) Package List: 1 x Tester with Protective Cover2 x Test Lead2 x Clip1 x Black Accessories1 x Red Accessories1 x Black Strap1 x Storage Bag1 x English Manual