Holder means are provided for holding one or more test soil devices for allowing a washing process to be tested. The holder means includes at least first and second members (8, 10), each member having a test soil device holding portion. At least said a portion of said first and/or second members (8, 10) is capable of undergoing relative movement between open and closed positions and said test soil device holding portions are arranged such that in the closed position, a test soil device (6) can be retained between surfaces of the test soil device holding portions of said members, and in the open position, the test soil device (6) can be located with and/or removed from said test soil device holding portions.
