NICE recommends the WatchBP Home A device is used in patients with suspected hypertension. The BP monitor automatically detects pulse irregularities caused by AF.
In draft guidance, it said use of the device by GPs and other primary care staff could help to spot more cases of AF, a key risk factor for stroke.
The device could save the NHS an estimated £26.7m a year, mainly from the reduced cost of treating stroke, according to NICE.
Professor Carole Longson, director of the NICE Centre for Health Technology Evaluation, said detecting more AF cases would allow clinicians to offer patients preventive treatment to reduce their risk of a stroke.
She said: 'The guidance is not about screening for AF, but about the benefits that the device offers in helping to pick up AF by chance in people with suspected high BP or those being screened for high BP, in primary care.'
The WatchBP Home A is estimated to save between £2.98 and £4.26 for each patient aged 65 or over tested.