American Educational 7 Piece Acrylic Lens and Prism Set This tape measure features 7

This tape measure features 7 ft

Endothermic

Precise and easy readout

Comes with matching color keyboard skin

The Breaker Sniff-it remote does not require a battery and is powered by the outlet

American Educational 7 Piece Acrylic Lens and Prism Set This tape measure features 7Set of seven lenses and prisms for demonstrating optical principles and effects for students Includes double concave, double convex, trapezoidal, plano convex, and various triangular shaped lenses Made of acrylic for optical clarity The American Educational 7 Piece Acrylic Lens and Prism Set has lenses of different shapes for demonstrating optical principles and effects for students. The set includes double concave, double convex, trapezoidal, plano