nhs england and the body that regulates healthcare products are issuing new guidance on pulse oxygen meters — also known as 0ximeters — after it was found that the devices can overestimate oxygen levels in people with darker skin. with more here's our health correspondent, amara sophia elahi. this women caught coronavirus in december last year and eventually ended up in hospital with seriously low oxygen levels. so, basically, you flip the lid, put yourfinger in... she had been monitoring her levels at home with the pulse oximeter, but the meter consistently told her she was in safe levels. even as she increasingly struggled to breathe. when i went into hospital, the first thing they said was you really did leave it too late. had you left it any longer, iwould have been straight into icu. there is growing evidence that such monitors can overestimate oxygen levels in people with darker skin tones by 2%. that has led to nhs england