Sphygmomanometer help

I just bought this blood pressure cuff yesterday, the sphygmomanometer will not deflate past 40 mmHg and im just looking for some advice on how to fix it or what i did wrong specifically. Any and all advice is appreciated.

https://ift.tt/W8npGmP Submitted March 08, 2025 at 11:43PM by Bovack https://ift.tt/dQBrRjM