i bought this for 2.89 euro and i like it
handy if you have DC transformers with a to high DC voltage for your need
wide range of DC input / DC output voltage at 2 ampere
range 0-40V. (Note: Make sure that the supply voltage of 4 volts and higher for the accuracy of the voltmeter)
Press the button to switch the measurement LED display to input or output voltage
Press the touch button for three seconds to turn off the LED display
Input 4,0-40V (input voltage to the output voltage must be higher than 1.5v).
The adjustable output voltage range of-1.25 volts is 37V continuously adjust (the input voltage must be higher than the output voltage up to a height of about 1.5V)
The maximum output current up to 3A
Normal and stable operational current of 2A
3d print a case for this pcb
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