Three piece tester case also holds standard 9V battery.
Also needed: seven 3mm x 9mm screws.
Build from face up. Lay board on face section (MeterB1), then place middle (MeterB2) section on back of board, simultaneously pulling battery cable through middle section. Add three screws to sandwich the board in place. Note that cut-outs are to clear the components on the back of the board. The 9V battery is stored in the smaller room, connected to the cable. Use four screws to hold the back (MeterB3) in place, noting that the back is not x-y symmetrical.
openscad. Based on T3 M328 case.