Calibration us necessary and needs to be done to ensure your equipment is working within the guidelines. This is especially important if you do medicals for Railway workers as they ask for evidence your equipment is checked regularly on the annual audits. The audios can sometimes need tweaking to ensure they are recording within frequency ranges as they can alter Ideally you should do at least weekly checks on equipment yourself as best practice. Alcometers if you use them need 6 monthly calbrations
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