This 0.625" (1.6 cm) wide stainless steel response lever is designed to protrude 0.375" (9.5 cm) into the mouse test chamber 7/8" (2.2 cm) above the grid floor. By breaking a photobeam instead of depressing a mechanical switch, the force required has been reduced to as little as two grams. This unit includes an infrared light source and detector and 28 V DC control.
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