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Digital multimeter for your carby abo_hosni
Digital speedometer, tachometer & engine temperature displayby abo_hosni
Digital LED Voltmeter To RC Carby Ibenos
The Simplest Speedometer.CHECK IT OUT!by fahadshihab
Wet Cell Battery out of Foodby Toasty2222
The VoltPen (Highlighter into voltmeter)by newtonn2
Solar Science Stationby JoshuaZimmerman
Gel Electrophoresis Integrated System (GelIS)by Tequals0
Human-Powered Light--from my book, "Doable Renewables"by MikeTheMaker
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