7-Decade Resistance Box Lab Supplies_Stoppers this 6-inch Alnico bar pair

this 6-inch Alnico bar pair extends field lines visibly along the magnet body for full-class iron-filing demonstrations

letting students explore mechanical advantage by counting the supporting strands and measuring effort

integrating with standard projection setups for formative assessment and active engagement

Used to measure higher-current circuits up to 10 amps

7-Decade Resistance Box Lab Supplies_Stoppers this 6-inch Alnico bar pairUsed to dial in any resistance from 0 ohms to 1. 111110 megohms across seven cascaded decades, this resistance box at plus or minus 1% on each step replaces dozens of fixed resistors at the bench.