It depends on how frequently you change fixtures and the criticality of your tests. A good practice is to verify alignment whenever you set up a new test configuration (for example, changing from a tensile wedge grip to a compression platen could slightly affect alignment, so you’d check it then). The alignment device makes this easy – a quick check with the meter will tell you if anything is off. For labs under strict quality control, verifying alignment daily or weekly can be part of the routine (it only takes a few minutes). The device is stable, so you shouldn’t need to adjust it unless something in the load train changes or the machine has undergone maintenance. During machine calibration cycles (e.g., annual service), it’s wise to do an alignment check as well. In summary, regular quick checks are recommended, but large adjustments are rarely needed once the device is in place and your setup is consistent.