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"Complete Meter Stick Optics Bench"
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Eisco® Battery Operated Ticker Tape Timer
A great option for measuring motion when an external power supply is not available.
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SP Bel-Art H-B® DURAC® Four-Channel Electronic Timer with White Board and Certificate of Calibration, Bel-Art Products, a part of SP
This four-channel timer has a built-in white board and dry erase marker with eraser tip that helps keep track of time and other critical information.
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