Product Price SKU Quantity Subtotal Drop Counter Attachment for photogate Drop Counter Attachment for photogate quantity × $36.30 SKU: ESD50092 Subtotal: $36.30 Remove $36.30 ESD50092 Drop Counter Attachment for photogate quantity $36.30 USB LIGHT SENSOR USB LIGHT SENSOR quantity × $184.48 SKU: ESD50186 Subtotal: $184.48 Remove $184.48 ESD50186 USB LIGHT SENSOR quantity $184.48 Angle Sensor * Angle Sensor * quantity × $134.31 SKU: ESD50077 Subtotal: $134.31 Remove $134.31 ESD50077 Angle Sensor * quantity $134.31 Photogate with Pulley Photogate with Pulley quantity × $86.52 SKU: ESD50149 Subtotal: $86.52 Remove $86.52 ESD50149 Photogate with Pulley quantity $86.52 Coupon: Clear shopping cart Update cart Basket totals Subtotal $441.61 Total $441.61 Proceed to checkout Continue shopping