The optical lickometer (beta) is a device used to deliver liquid rewards and measure lick events in functional imaging and sensitive electrophysiology assays. It contains a steel drinking tube, a photogate positioned to measure licks, and a visible white LED for training feedback. The lickometer mounts securely to the end of a 6mm ThorLabs mini-series post. The mounting setup shown in the product photos (NOT included) allows coarse adjustment in 3 dimensions, and rotation about 2. Its components are itemized on the wiki, and can be selected to match the dimensions of your assay. NOTE: while an earlier lickometer variant has been used in the wild, the current design revision is new and HAS NOT BEEN EVALUATED. If you order it, we will work closely with you to ensure that it functions as intended.