The 2031 Extra-large Diameter Silicon Optical Receiver allows you to tweak your experiment without worrying about the beam wandering off the detector. Just position the 8 mm diameter, 400 to 1070 nm Silicon detector close to where you think the laser beam is and you'll see a signal. No more time-consuming and tedious alignment photoreceiver procedures. This free-space optical receiver has a 8-32 mounting thread and includes an M4 metric adaptor and tool.