... diagram with amplification function convenient for observation and analysis. 12. Display waveform and have amplification function. 13. Users ... Extended measurement: PT secondary voltage drop, PT secondary load, CT secondary load. 24. GPS interface is reserved, which ... 120V, 240V, 480V, automatic gear shift. 4. Current input: built-in current transformer: 1mA~12A, automatic gear shift. Clamp meter: 5A ...