Which one is more reliable,
- upper arm or wrist type?
- battery powered or with adaptor?

I have no experience sa wrist type, nakita ko lang sa lazada na mas mura.

Yung gamit namin ngayon is the battery powered type. Minsan na-discharged yung battery so I had to borrow one which is the adaptor type. I used it for one week and was surprised na magkaiba ng reading, mas mababa ng mga 10 points yung adaptor type. When I went to the hospital parang mas malapit ang reading ng adaptor type.

May paraan ba para ma-calibrate yung reading? Medyo malaki din yung difference na +10 points