It can be used as a USB tester or as a DC voltmeter. It is a high-end product created by the wisdom of the industry!UD24 2.4 inch USB tester DC5.5 type-c digital voltmeter ammeter power bank voltage detector volt QC PD electric meter for APPVoltage measurement range: 5V ~ 32.0VCurrent measurement range: 0.00 ~ aSynchronization time: 999 hours 59 minutes 59 secondsInput interface: Type C / Micro-USB / USBOutput interface: Type C / USBTime charging reminder setting: Countdown 24 hours any set valueUSB D + voltage range: 0V ~ 2.99VUSB D-voltage range: 0V ~ 2.99VUpdate time: more than 500mS / timesMeasurement rate: about 0.5 times / secAlarm mode: siren sound + double display warning warningDisplay type: 2.4 high cost true color digital display large screen with Chinese and English measurement interfaceSelf-consumption current: less than 0.02aWorking temperature: -10 ~ + 60 -10 ~ + 60Operating humidity: 10 ~ 80 (no doubt) 10 ~ 80 (no doubt)Working pressure: 80 ~ 106kPacolour: blackMaterial: ABSsize: 125x59mmPackage Contents:1 x UD24 teterOnly 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.