THANKS FOR THAT. I'M CURRENTLY USING ONE CALLED, OXILINE. AND ANOTHER ONE FROM TELEDOC CALLED LIVONGO. THEY BOTH READ QUIT A BIT DIFFERENT FROM EACH OTHER AT TIMES.
In the UK at least glucose fingerprick meters have an allowable inaccuracy of up to 15%, 95% of the time. So a true value of 6.0mmol/l could show as anything betweem 5.1 and 6.9 mmol/l. For the US in mg/dl you might think of a true value of 100mg/dl showing as anywhere within a range 85-115 mg/dl.
I'd expect most readings to cluster around the true value, but you should expect variation. And one in 20 readings is allowed to be outside that +/-15% range, and still be acceptable in accuracy terms.
I recently had my HbA1c taken by my GP and their machine result was very far away from what I expected. I've been in normal BG range for five years now, so wasn't expecting the highest HbA1c result I've ever had. I challenged it, and they agreed to do a further blood draw which would be lab tested. Lab test confirmed that the GP machine was wrong. So two blood samples taken within minutes of each other produced results which were very different.