Starting your own PAT testing business? – These books may help. Products from Amazon.co.uk -30% Code of Practice for In-service Inspection and Testing of Electrical Equipment 4th Edition (4th Edt) (Electrical Regulations) Price: £38.49 Was: £55.00 Starting and Running a PAT Testing Business Price: £14.50 Manual of Portable Appliance Testing Price: £11.00 Handbook of Portable Appliance Testing: The Complete Reference Book for Anyone Wanting to Carry Out PAT Testing Price: £32.00 Thinking of doing your own PAT testing? Here are some of the PAT testing machines available from Amazon. Please remember that all PAT testing machines should be re-calibrated at least every year.