This kit includes an overhead fixture and alternate illuminator fixture for using the overhead method to measure contact angle - ideal for hydrophilic surfaces and substrates with surfaces in valleys (surrounded by vertical topography). The Automated Dispensing System is recommended for accurate drop volume. Requires DROPimage Advanced v2.6 (or higher) but upgrade from 2.x to current version of DROPimage Advanced is included in kit price for use with existing instruments. Please specify instrument s/n when ordering. Can also be ordered with any new instrument that includes DROPimage Advanced. Note that the Overhead Optical Imaging Kit is designed to work on the specimen stage and is not supported for use in chambers or on rotating wafer supports.