Features
High stability and no sensitivity to the ambient light
Laser-cut acrylic (plexiglass) enclosure
Cost-effective
Flow control capability of the hand-sanitizer/alcohol (efficiency)
Through-hole components (easy to solder)
Single-layer PCB board (easy to fabricate)
Single and cheap...
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how to build ahand sanitizerdispenser
how to make a handsanitizerdispenser