Variable Angle Glass Prism, 20° x 20° x 140° Lab Equipment and Supplies_Lab Equipment Dual metric and imperial markings

Dual metric and imperial markings on this PVC-coated fiberglass thirty-meter tape measure

Aluminum-cased plotting compass with a glass face and a dial marked with principal points

Acrylic double-concave lens at 86mm length and 20cm diverging focal length

the leaded body delivering pronounced spectral separation for comparing dispersion against crown and flint baselines

75 inches on a swivel boss head that fits rods up to 18mm

Variable Angle Glass Prism, 20° x 20° x 140° Lab Equipment and Supplies_Lab Equipment Dual metric and imperial markingsPairs a 20 apex with 20 x 20 x 140 geometry on a glass prism, the apex angle pushing deviation past the small angle linear regime into the curved deviation vs angle zone.