3. The test rig as specified in clause 6.1.1 of BS 5852: Part 2 shall have expanded steel platforms of not less than 28×6 mm mesh size. The test rig is placed on a metal tray of sufficient dimensions to collect any debris falling from specimens being tested. The rig and debris tray shall be mounted on a weighing balance with a remote readout having a full-scale deflection of at least 0 to 20 kg to an accuracy of 2 g.U.K.