Features 1、Electrical Measurement: Insulation resistance measurement, alternating current (AC) electrical measurement, direct current (DC) electrical measurement. 2、Good Functions: Small resistance measurement, measurement data lock, low battery indication, large LCD digital display, backlight display function. 3、Reliable Performance: External direct current (DC) power supply DC9V 1.5A, overrun prompt, red alarm light, buzzer alarm, high voltage prompt. 4、Scope of Application: Suitable for insulation resistance detection of motors, cables, electromechanical equipment, telecommunication equipment, power facilities, etc. 5、Product Parameter: To ensure accuracy ambient temperature is 23±5℃. Relative humidity is &lt;75%. Frequency response of AC voltage is 50～200Hz. Voltage input impedance is 1MΩ. Specifications Item Type: Digital Insulation Resistance Tester Material: ABS Color: As Pictures Shown Weight: Approx. 927g / 32.7oz Model: GT5307A Product Size: Approx. 16.5x11x7.5cm / 6.5x4.3x3.0in Accuracy: ±(a% of reading and least significant digit) To Ensure Accuracy Ambient Temperature: 23±5℃ Relative Humidity: <75% Application: Suitable for Insulation Resistance Detection Of Motors, Cables, Electromechanical Equipment, Telecommunication Equipment, Power Facilities, etc. Technical Parameters: technical indicators Display: 3 1/2 LCD display, the maximum reading is 1999 Over Limit Indication: only the highest digit displays 1 when the upper limit is exceeded Sampling Rate: about 3 times per second Altitude: <2000 meters Use Environment: indoor use, pollution degree 2 Storage Environment: -40℃-60℃, relative humidity <90%RH Overload Protection: 100mA/60v resettable fuse Low Battery Prompt: +- symbol appears on the screen Power Supply: 6pcs 1.5V AA batteries or external current 9V adapter (without battery) Current Consumption: power consumption under no-load test <300mW Short Circuit Current: <1.8mA Resistance, Continuity Test: 0Ω-2KΩ, <50Ω buzzer sounds, test current: 1mA, Base Accuracy: ±(0.8% reading and 6 digits) Jack Location: Insulation Resistance: E and L Package List 1 x Tester with Protective Cover 2 x Test Pen 2 x Clip 1 x Black Accessory 1 x Red Accessory 1 x Black Tape 1 x Storage Bag 1 x English Manual