Which is the most commonly used? "High-voltage megohmmeter" is a measuring instrument commonly used by electricians. "High-voltage megohmmeter" is mainly used to check the insulation resistance of electrical equipment, household appliances or electrical lines to the ground and between phases, to ensure that these devices, appliances and lines work in a normal state, to avoid accidents such as electric shock casualties and equipment damage. There are three main specifications of the "high voltage megohmmeter" on the market: 1. Model: BY2671 high voltage megohmmeter. Technical parameters: voltage level: 500V, 1000V, 2000V, 2500V four voltage levels, range: 20GM. 2. Model: UT513 high voltage megohmmeter. Technical parameters: voltage level: 500V, 1000V, 2500V, 5000V four voltage levels, range: 200GM. 3. Model: BC2565 high voltage megohmmeter. Technical parameters: voltage level: 5000V, 10000V, two voltage levels, range: 400GM. The user selects high-voltage megohmmeters of different specifications according to the tested product.