Review on 🔌 Multipurpose LED Tester for LED TV Backlight and Constant Current Driver Board in LED Lights Repair - Output Range: 0-330V by Eric Schwalbe

The controls are a bit odd; Decreasing the current setting also decreases the voltage. With a current near the minimum, the voltage is zero, regardless of the voltage setting. This device has a power switch so you can ideally leave it at your work station, plugged in and ready to go! Its best feature is 1mA mode, no waiting time. -out so you don't have to restart the tester every time you leave it for a few seconds. Perfect!