1. The signal generator is small in size, has many functions, easy to operate and easy to carry.2. The key layout is reasonable, all functions have independent corresponding keys, easy to operate.3. Built-in battery, low power consumption, long standby time.1.Manual range2. Non current 550V high voltage protection3.4000 word display4. Backlight display, anti break bracket5. Automatic shutdown6. Current measurement7. AC voltage / NCV / capacitor / temperature / on / off / diode / resistance