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Automatic Digital TTR Meter Portable Three Phase Transformer Turns Ratio Tester. Three-Phase Simultaneous Test: Measures three-phase voltage ratio and turns ratio in one fast operation. Wide Test Range: Covers test range from 0.9 to 10000 for various transformer types. Advanced Protection Features: Includes reverse polarity, short circuit, and tap-changer protection. User-Friendly Interface: 65K true color LCD with menu-driven operation for easy use. Versatile Connectivity: Equipped with USB, RS232 ports, and print output for data management. Durable Portable Design: Sealed, waterproof, and shock-resistant engineering plastic casing. Comprehensive Transformer Support: Suitable for Z type, rectifier, grounding, and furnace transformers.