One day, the SpO2 reading showed below 90, an indication that the patient needs hospitalisation.
The HM Trust, established in 1996, has procured 200 oximeters and is keeping the same at milk outlets, vegetable shops and petrol pumps to help the people get tested and approach the hospitals.
The oximeters will be distributed to slum-dwellers in Bengaluru and rural women in Koppal in North Karnataka.
Meanwhile medical experts said that pulse oximeters, which come from trusted brands and are accurate, can be used to monitor oxygen level of those who are having symptoms of Covid-19.
With reports of hospitals gasping for oxygen and patients waiting for beds, people are seen making a beeline to chemist shops and returning home with bags full of 'medical essentials'.