Phenol Red Solution, 1.0%, 500mL, Laboratory Grade Pack Size_14 The includes screw cap has

The includes screw cap has a built in leak-proof ring seal

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

23mm diameter magnetic base with a removable metal hook

Plane glass mirror for classroom optics

Larger 75 x 13 x 10mm Alnico U-shape with the standard 18mm pole gap

Phenol Red Solution, 1.0%, 500mL, Laboratory Grade Pack Size_14 The includes screw cap hasConcentrated 1 percent phenol red indicator, supplying sharper color transitions across the 6. 8 to 8. 2 pH range when sample volumes are small.