50m Fiberglass Tape Measure with PVC Cover and Winding Handle Base Size_10 x 6" the pivoted magnet arm engaging

the pivoted magnet arm engaging or disengaging the induced drag on command

One-percent aqueous copper(II) sulfate solution at 30mL

and joint articulations for skeletal anatomy teaching

Portable salinity water kit determines salt concentration through conductivity testing

the unit also runs as a motor on 6-8V DC for energy conversion demos

50m Fiberglass Tape Measure with PVC Cover and Winding Handle Base Size_10 x 6" the pivoted magnet arm engagingWaterproof and non conductive fiberglass fifty meter tape measure with PVC coating and a flush winding handle, suited to outdoor surveying and long distance laboratory measurement.