1.Digital LCD display for easy reading, measurement data and graphs can be displayed 2.Rotary switch control, button measurement is easy to use 3. and hold the test button to exit the frequency measurement function. The frequency measurement range is from 1Hz to 1MHz or more, and when the measured frequency is lower than 25KHz, the period is displayed 4.Square wave generator, there are multiple levels of square wave frequency optional, left or right hand test button to switch different square wave frequencies, long the test button to exit the square wave generator 5.Pulse signal generator, left-hand or right-hand test button adjusts the duty cycle of the pulse from 1% - 99%. and hold the test button to exit the pulse signal generator The power supply is powered by the 5V Type-c power supply interface, and customers can also solder the 9V battery interface for power supply Automatic shutdown, shutdown current is only about 20nA Note: Before testing the capacitor, discharge the capacitor and then insert the test stand for measurement, otherwise it may damage the microcontroller of the tester. Input voltage: DC5V Working voltage: about 30mA, istor tester control The tester is controlled by a rotary encoder switch, The rotary encoder switch can have a total of 6 operations, short , long , left hand, right hand, hold left hand, hold right hand. once in the shutdown state to turn on the power and start the test. After a test is complete, if no device is detected. Long the switch or left and right rotary switch to enter the function menu, after entering the function menu, the left or right rotary switch can be above and below the menu item, to enter a function item, then short the switch. When you need to exit from a function, and hold the switch. Specifications: B:English version Colour:As Shown Material:Metal + Plastic Package Contents: 1 x GM328A istor Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.