Adjustable BEC with Voltage View Window

I needed a 3.3Vdc BEC (power supply) for a rover I'm building and this is what I came up with. I used a DC-DC 5A Buck Converter 4-38V to 1.25-36V Step-Down Voltage Regulator High Power Module with LED Display as the BEC but also wanted the display to be visible just in case of any voltage drift caused by the rover bouncing over the yard. I used a small piece of 1/8 inch Plexiglas cut to fit the window opening. It has close tolerance and the Plexiglass is just a press fit.