I may be a little late to the party on this one, however I use Accu-chek Instant (which I bought prior to diagnosis), GlucoRX/Nexus (which my GP needs me to use) and I’m also currently trying out Libre CGM (courtesy of the local healthcare diabetic team). Instant works well standalone and reporting data into the Apple Health app. I also use an Omron blood pressure monitor which does the same and I have an Apple Watch which records my blood oxygen saturation (plus or minus two to three percent.) Interestingly the Instant and Libre are usually within 0.5 of one another whilst the GlucoRX can read as much as 2.2 to 2.5 mmol/L higher. I’m very happy with the Instant (but love the Libre).