This instrument is accurate, reliable and easy to operate. For insulation resistance test, you can change the test voltage among 250V, 500V and 1000V. it can also be used to test ACV, resistance which is less than 200Ω, and test for continuity. You can use it to test transformer, motor, cable, switch, electrical appliance as well as to do insulation resistance test. Features 1.True measurement of speaker systems actual impedance at 1kHz 2.Three test ranges (20Ω / 200Ω / 2000Ω) allow testing of home theater and commercial sound systems. 3. Convenient portable battery operation. 4.Low battery indication 5. Data hold function 6.Timer function for easier operation. The timer can last about 30 seconds minutes after users press TEST button. 7. Auto power off: after about 15 minutes of non-use. Technical Specifications Display: LCD 3 1/2 digits (2000 counts), with unit Data Hold Indication: H symbol appears on the display Power supply: 9V DC (6 x 1.5V AA battery) (Not provided by seller) Accuracy is specified for a period of one year after calibration and at 18℃ to 28℃, with relative humidity Accuracy specifications take the form of : ±([% of Reading] + [number of Least Significant Digits]) Range: 20Ω / 200Ω / 2000Ω Resolution: 10mΩ / 100mΩ / 1Ω Accuracy: ± (2%+2) (or ± 0.1Ω) Test Frequency: 1kHz

• Test voltage among 250V, 500V and 1000V.
• Test voltage can be changed by the rotary switch. LED used as normally working indicator under high voltage condition. High ability to withstand high load.

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