Phenol Red Solution, 1.0%, 500mL, Laboratory Grade Pack Size_14 Standard rheostat with oxidized constantan

Standard rheostat with oxidized constantan winding on a vitreous-enameled steel tube and a heavy-duty sliding contact

23mm diameter magnetic base with a removable metal hook

Length-adjustable wooden pendulum simple-machine model with a blue bob sliding along the string and a wooden guide keeping the swing on a consistent path for period-vs-length measurements

2mL graduations

Plane glass mirror for classroom optics

Phenol Red Solution, 1.0%, 500mL, Laboratory Grade Pack Size_14 Standard rheostat with oxidized constantanConcentrated 1 percent phenol red indicator, supplying sharper color transitions across the 6. 8 to 8. 2 pH range when sample volumes are small.