- Clamp design for safety and reliability. The rotary gauge non-contact measuring clamp design includes range indicators for easy operation. - Easy operation and versatile functions. This rotary tester suits energy maintenance, railway circuits, home use, industrial and mining enterprises, and factory facilities. - Working parameters and capabilities. Clamp wire diameter 1.5 mm to 16 mm. Features include phase detection (positive phase, reverse phase, missing phase), inspection under voltage, simple current testing, fault location, and line repair. - Power and endurance. Powered by 3 V DC with 2 x AA alkaline batteries (not included) for approximately 70 hours of continuous operation. - Magnetic mounting. The back of the three-phase rotation meter has four magnets for convenient attachment to metal surfaces during testing.