Stackable Connecting Lead, Model X Entomology & Zoology_Zoology Charts & Models letting students measure rotational distance

letting students measure rotational distance against linear advance to derive the mechanical advantage of the spiral

expanding and closing to suit different optical-component sizes on a single bench-mounted holder

Hand-cranked cam turning against both a straight follower and a lever follower

with identical volumes across specimens for direct mass-density comparison

Stackable Connecting Lead, Model X Entomology & Zoology_Zoology Charts & Models letting students measure rotational distanceUsed in high current circuits where exposed plug pins are not acceptable, this 4mm stackable safety lead carries up to 12A through nickel plated split hollow pins on both ends.