Thanks. Done.
Nxstage says:
A&D Medical Deluxe Upper Arm Blood Pressure Monitor with Bluetooth (UA-651BLE)
https://www.amazon.com/gp/product/B00MXTE7CS/A&D Medical Wireless Connected Weight Scale, Black (UC-352BLE)
https://www.amazon.com/gp/product/B00MXTDWUGFWIW, for an UNofficial wrist bp monitor on Amazon, I asked "Has anyone successfully paired this with the Nx2me NxStage app?"
Answer: "Yes I have been able 2 pair it with the app and it works well. Great way to track ur progression daily."
https://www.amazon.com/gp/product/B0778LRF3Y/ I ordered the A&D bp monitor and scale but for $24 I might take a chance on the wrist monitor if I dislike the upper arm cuff.