1、LCD display 1999 digits count, over limit indication 2、With AC voltage measurement function 3、PI polarization index and DAR insulation absorption ratio measurement, automatic calculation of resistance ratio 4、With CONTINNUIY low resistance grounding continuity measurement function 5、ZERO low resistance zero function to improve measurement accuracy Features: 1. LCD display 1999 digits count, over limit indication 2. With AC voltage measurement function 3. PI polarization index and DAR insulation absorption ratio measurement, automatic calculation of resistance ratio 4. With CONTINNUIY low resistance grounding continuity measurement function 5. ZERO low resistance zero function to improve measurement accuracy 6. Automatic shutdown to save battery power 7. Backlight function for easy operation in dark light 8. Automatic discharge, automatic release voltage function 9. Continuous measurement mode with red warning light and buzzer alarm function 10. The instrument complies with UL and CE European Community standards 11. Mainly used to check the insulation resistance of electrical equipment, household appliances or electrical lines to the ground and phase to ensure that these equipment, electrical appliances and lines work in a normal state, to avoid accidents such as electric shock, injury and equipment damage. 12. It is an ideal test instrument for measuring insulation resistance of transformers, transformers, generators, high voltage motors, power capacitors, power cables, lightning arresters, etc. Specification: Condition: 100% Brand New Model: UT502A Specifications Range Best Accuracy Insulation Resistance (Ω) Test Voltage 500V/1000V/2500V 0%-10% 500V 0.00MΩ-99.9MΩ ±(3%+5) 100MΩ-5.0GΩ ±(5%+5) 1000V 0.00MΩ-99.9MΩ ±(3%+5) 100MΩ-5.0GΩ ±(5%+5) 2500V 0.00MΩ-99.9MΩ ±(3%+5) 100MΩ-9.9GΩ ±(5%+5) 10.0GΩ-20.0GΩ ±(10%+5) Load Current 50V (R=50kΩ) 1mA 0%-10% 100V (R=100kΩ) 1mA 0%-10% 250V (R=250kΩ) 1mA 0%-10% 500V (R=500kΩ) 1mA 0%-10% 1000V (R=1MΩ) 1mA 0%-10% 2500V (R=1MΩ) 1mA 0%-10% Short Circuit Current <2mA Low Resistance (Ω) 0.01Ω-200Ω (about 5.0V/>200mA） ±(2%+3) AC Voltage (V) 30V-600V ±(2%+3) Features Display Count 2000 DAR 60s/15s and 60s/30s Yes PI Yes Auto Range Yes Low Battery Indication Yes LCD Backlight Yes Alarm Light Display Yes Alarm Buzzer Yes High Voltage Indication Yes Over Load Indication Yes Auto Disharge Yes Test Voltage Vice Display Yes 10MΩ Internal Resistance Test Yes General Characteristics Power 1.5V Batteries (LR6) * 6(not included) LCD Size 70.6mm * 34mm Product Color Red and Grey Weight: Approx. 785g / 27.7oz Size: Approx. 150 * 100 * 71mm / 5.9 * 3.9 * 2.8in Package List: 1 * Insulation Tester 1 * Hanging Rope 2 * Crocodile Clip 2 * Testing Cable 2 * Test Table Stick 1 * Back Cover 1 * Black Bag