The key to modern medicine has to be our ability to diagnose and observe the conditions that we are all capable of getting at some point in our lives. To this end it is vital that the machines that are used in the medical industry are of the highest standards and calibrated for proper use. This is not something that they can undertake themselves. It is something that only outside professionals with a deep understanding of the machines involved and what they can do for them.
Put simply without medical equipment being tested and correctly calibrated the machines will not return an accurate result to the person looking to use it. Therefore it is vital that this task happen on a regular basis. Luckily there are professional organisations like https://medi-cal.co.uk/ who can come along and look at doing your Medical Equipment Calibration to an incredibly precise and high standard.
All machines degrade overtime and this can cause a huge difference in the readings that can result in disaster if it is not read correctly. This is why machines have to be calibrated and reset. Any anomaly could result in a miss or mis-diagnosis delaying treatment and possibly causing issues for the patient in the long run or even the wrong perspective that will not give the relief that is required. This is why Hospitals and medical facilities have robust checks and balances in place to make sure that the worst scenario never happens.