0.02% Aqueous Phenol Red Indicator Solution, 100mL Chemical_Phenol Red Cover-protected 10-ohm 4A single rheostat

Cover-protected 10-ohm 4A single rheostat with constantan winding on a 200x56mm tube and 4mm safety socket terminals

Series and parallel reconfigurable variable battery power supply holding up to four D-cells

shoot emergence

and an 18mm attachment diameter for pulling small weights in mechanical-advantage experiments

Heavy-flint glass prism at refractive index 1

0.02% Aqueous Phenol Red Indicator Solution, 100mL Chemical_Phenol Red Cover-protected 10-ohm 4A single rheostatPre dissolved 0. 02% aqueous phenol red solution at 100mL, the ready to use indicator for cell culture media pH monitoring and biology acid base demonstrations near the neutral range.