Review on PEMENOL DC-DC CNC USB Step Up/Down Power Supply Regulator Module: Adjustable Boost Buck Voltage Converter with Digital Display Voltmeter Ammeter and Battery Capacity Tester by Tyrone Carter

The finish is decent, it works, the tensions are right. OCP works, tested by shorting the wires, and OPP works under heavy load. The only problem I found is the tedious voltage change, pressing the buttons gives you a 0-0.03 volt change, holding the buttons gives you a ramp but it takes about 24 seconds to go from 1 going from V to 24V and the display often lags needing to go the other way to get to where you really want to be there is no way to change the voltage without turning on the output the zeros are flashing, when they are off and in amp mode but not watt mode, and turning off the backlight also toggles the wattage display from A to W (or W to A) so you toggle it back after you turn the backlight on have to.