Maintenance Record : Your workplace may have a service contract covering such things as balances. This means that they should be checked (and repaired, if necessary) by a visiting engineer. If you don't have a service contract or if it is not possible to have one, you may choose to maintain some pieces of apparatus and equipment yourself, e.g. microscopes. It may also be necessary to send a piece of equipment back to the supplier for repair. In all these cases, you should keep a record.