到亚马逊上看看，找个最多星星的（Review 人数一定要过万），价钱合适的就好。里面两种都可以试试。

https://www.amazon.com/2020-Blood-Pressure-Monitor-LAZLE/dp/B07WCQVV71/ref=sr_1_4?crid=2URB8SEBJ3JJZ&dchild=1&keywords=blood+pressure+monitor&qid=1618596209&sprefix=blo%2Caps%2C233&sr=8-4

 

https://www.amazon.com/Omron-Pressure-Monitor-Storesup-Readings/dp/B07S2H3XB9/ref=sr_1_5?dchild=1&keywords=blood+pressure+monitor+Omron&qid=1618595952&sr=8-5

 

不过老实说，这类型的再好，与水银血压计还是有差距，主要是 consistency.