Epoxy-Coated Steel Wire Test Tube Rack, 24-Hole, 15-16mm Hypotenuse_35mm transmitting maximum light when their

transmitting maximum light when their axes align and nearly extinguishing it when crossed at 90 degrees

Illustrates that sound needs a medium to travel through a 10-inch acrylic bell jar with internal buzzer

Cut-out at one edge slips this 125 x 70 x 200mm matte-white metal screen over a meter rule for vertical or horizontal positioning during optical-bench image-formation work

Alternate-model orange soft rubber tubing at 15 mm bore

with numbered and lettered positions and a stacking design that locks against lateral movement

Epoxy-Coated Steel Wire Test Tube Rack, 24-Hole, 15-16mm Hypotenuse_35mm transmitting maximum light when theirCoated with chemical resistant epoxy and rated to 121 C, this steel wire test tube rack holds 24 tubes of 15 16 mm diameter in a four by six grid for drying and storage.