Color: Dark gray&yellow LCD Size: 75 x 52mm Dual Alarm: sound and light. The display returns to zero when a shortcut resistance occurred, to prevent burning underground. The special design of the battery Monte easily. An insulation tester accurate, reliable and easy to use. rge LCD screen, LCD backlight ON / OFF key, easy to read. Strong anti-magnetic and anti functional disturbance. Full function protection, high voltage anti circuit design. High voltage and short alarm input. LCD Backlighting: Approx. 10 sec Input Impedance: 1 M¦¸ Sampling rate: 3 times / sec. AC Frequency response: 50-200Hz Operating mode: Manual range Max. screen: 1999 Power Supply: 1.5V AA battery x 6 pcs, power supply or external DC 9V (not included) Power consumption: Quiescent current approx. 3mA Weight: about 660g Dimensions: 176 (X) x 116 (W) x 62.5 (D) MM Note: Median resistance ensures that two terminal voltages is not less than 90% of the test voltage limit value low terminal resistance measurement. Package List: 1 X Digital Insulation Tester