2-Speed Ticker Tape Timer with 12V Power Supply Entomology & Zoology_Entomology Supplies and continuous DC demonstrations beyond

and continuous DC demonstrations beyond the reach of dry-cell stacks

electroplating

and elastic limits

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

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 and continuous DC demonstrations beyondAdjustable 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.