A9 JTX Curve Waveform Multi-function Measuring Meter for Mobile Phone Motherboard Current Voltage Diode Measurement. Function: It is a high-precision testing device used for measuring voltage, current, power, and diode values, primarily for repairing electronic products like mobile phones, batteries, and chargers. Display: It features a 4.0-inch IPS HD display with support for pointer, curve, and digital display modes. Capabilities: It supports a voltage range of 0-36V and can measure instantaneous dynamic voltage with high capture speed. Features: The device includes charging power calculation, ultra-high-speed diode scanning for leakage detection, and cloud firmware upgrade capability.