Whether or not one is required to have it done, responsible clinicians ensure their equipment is operating safely and effectively for the benefit of their patients. Manufacturers recommend annual calibration for the reasons detailed in the “WHY IS IT NECESSARY TO HAVE MY ULTRASOUND CALIBRATED?” section. Governing bodies may also have regulations that apply to you. For example, annual calibration is required for measuring instruments used at facilities accepting Medicare (42 CFR 410.33). And, the Commission on Accreditation of Athletic Training Education (CAATE) requires annual calibration for ATP lab equipment as well as for the equipment at their preceptor sites. There is also the issue of liability which rests solely on the principal(s) of the facility should they choose to forego regular equipment safety and calibration services.