... of oil sampling tests, the test data can be reviewed and printed in 100 years even after power is off.The ... Strong anti-jamming, high precision testing.Small measurement, light weight, and convenient for outdoor operation.Technical parameterPower supply: AC220V±10%, 50HzOutput ... : temperature:-20°C ~ 60°C, humidity: max relative humidity 75% Insulation Oil and transformer oil Dielectric Strength Tester