BENETECH GT5307B Professional LCD Digital Insulation Resistance Tester Features 1. It is suitable for measuring the insulation resistance of various electrical equipment and insulating materials such as transformer, motors, cables, switches, electrical appliances, etc. 2. Icon displayalarm light onbuzzer alarm three types of alarms to prevent the danger of electric shock. Multiple gears can be selected to measure high and low, and the voltage can be measured after shifting. 3. This instrument is a high performance digital instrument, with large LCD display, display screen make it easy to read measurements. 4. Insulation resistance meter is beautiful, wide range, high accuracy, high resolution, convenient operation, easy to carry. 5. Resistance short circuit protection makes the measurement safer and more assured. Carry out maintenance, testing and verification of various electrical equipment. Functions 1. Measurement of insulation resistance 2. AC measurement 3. DC measurement 4. Small resistance measurement 5. Live detection of tested resistance 6. Short circuit protection of measured resistance 7. AC and DC automatic identification 8. Measurement data is locked. 9. Polarization Index 10. Absorption ratio test 11. Automatic discharge 12. Low battery reminder 13. Large LCD screen digital display 14. External DC power supply DC9V 1.5A 15.10M internal resistance measurement 16. Over limit alarm 17. Auto range 18. Red alarm light, buzzer alarm. 19. High voltage alarm 20. Test voltage display Specification 1. Technical parameters display: Large-screen LCD (up to 500 counts). 2. Over limit indication: Hi: The mark appears on insulation resistance range. 3. Auto range: Higher range: 500 counts, Lower range: 1 count (only on insulation resistance range) 4. Sampling Rate: 2 times second 5. Allowed altitude: Less than or equal 2000m (for indoor use) 6. Operation environment: Temperatur