American Educational 7 Piece Acrylic Lens and Prism Set Frequency and time weighting meet

Frequency and time weighting meet IEC651 type 1

BRILLIANT DESIGN: Comes with PP flip cover to protect keyboard and screen from scratching

Self-contained suction power and heating element

Single Knob Controls Head Movement Through 3 Planes

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American Educational 7 Piece Acrylic Lens and Prism Set Frequency and time weighting meetSet 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