An automatic defibrillator gets taken apart and analysed.
If you want the flipdot indicator, search ebay UK for flipdot
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https://www.youtube.com/watch?v=pn-Wv9YAfv0
mikeselectricstuff merchandise : https://mikeselectricstuff.creator-spring.com/
Barringer/Smiths Detection ion mobility spectrometer for finding naughty things on air passengers.
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https://www.youtube.com/watch?v=7L3GFmukGqc