Material: ABS colour: As shown Package Contents: 1 x Handheld Positive and Negative Voltage Signal Generator Kit 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. Fine tuning mode: adding or subtracting 1 from the last digit x (coefficient 150); Coarse adjustment mode: add or subtract 1 from the penultimate digit x (coefficient 1-50); The above two coefficients can be set separately for fine adjustment mode. The minimum can be set to 0.01mA per pulse, and the maximum coarse adjustment mode can be set to 5.00mA per pulse 04 Big Nixie tube display encoder button adjustment Turn on the battery switch, press the "MODE" key for 1 second, and the Nixie tube flashes to display the battery voltage for 5 seconds; Three types of battery indicator lights are used to demonstrate the battery level