@grrranny I use a Dexcom G6. (I will be inquiring about the Dexcom G7 at my endocrinology appointment next month.) The Dexcom G6 and the glucometer readings are usually quite close (within about 10 points) EXCEPT in the 24 hours after a sensor change. On the day of a sensor change I can expect SERIOUS inaccuracies. Sometimes it has lasted 24 - 72 hours! An example of this was getting a low alarm in the middle of the night telling me I was 48 but the glucometer was 139! I’ve had MANY phone calls to Dexcom customer support for this type of thing. It is frustrating because the Dexcom G6 sensor has to be changed every 10 days. That seems like too much time to have discrepancies like that! Also I use an Omnipod 5 insulin pump. The two devices “communicate”. I really dislike it when Dexcom G6 tells Omnipod 5 to put the brakes on my basal insulin delivery and I find out it is because of an invalid low. Then the next thing I know Dexcom G6 shows that I’m 300 something!