Portable Digital Voltmeter, 0-20V DC Subcategory_Zoology Models demonstrating mechanical advantage as the

demonstrating mechanical advantage as the angle of incline changes the effort needed to roll the cart up the slope

holding twelve tubes up to 22 mm diameter for classroom and professional bench setups

this 40-piece optical bench kit pairs an aluminum track and sliding holders with lamp

and accessories for combined friction and inclined-plane work

Portable Digital Voltmeter, 0-20V DC Subcategory_Zoology Models demonstrating mechanical advantage as theBattery powered portable digital voltmeter measuring 0 20V DC at plus or minus 1 digit accuracy on a large LCD, sized to give student bench setups a direct numeric reading without analog parallax.