2-Speed Ticker Tape Timer with 12V Power Supply Entomology & Zoology_Entomology Supplies Compares liquid-expansion rates by suspending

Compares liquid-expansion rates by suspending five removable glass bulbs-and-tubes in a shared heated water trough

With every complete revolution of the drive wheel

electroplating

varying the pole gap from 0

designed to hold visible iron-filing field lines and support side-by-side magnet-strength comparisons in mechanics labs

2-Speed Ticker Tape Timer with 12V Power Supply Entomology & Zoology_Entomology Supplies Compares liquid-expansion rates by suspendingAdjustable between 25 and 40 dots per second, this two speed ticker tape timer turns paper tape into a visual record of distance, velocity, and acceleration over time.