Crystal (Xtal) Tester / counter kit
thingiverse
This inexpensive Crystal tester comes with space for a battery, although it's not encased in a bombproof design, it is remarkably light. You won't need to use much PLA to print this case at all. Simply drill a 6mm hole for the power switch wherever you prefer. Self-tapping screws will be used for both the tester and its cover.
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