April 2, 20224 yr Uses one of these, with a slot cut in the case, piece of acrylic on top. Meter is powered from a button cell, to save space. No external switches - to avoid water ingress - just hold your phone case close to switch the display on. Reed switch inside the case is operated by the magnet on the phone case clasp. Edited April 2, 20224 yr by PastyMan
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