How tight to make HRM work?


how tight watch have to make hrm work? have have uncomfortably tight accurate. have 42mm using s/m band , not have tattoos.
 

i don't have watch yet, imagine there number of factors can change how tight needs accurately read heart rate. someone, me imagining incredibly easy @ tightness because have veiny arms. also, amount of fluids have in system may affect well. while typically affect bioimpedance sensors wayyyy more, can affect affect on size of veins , how close surface of skin.

way on both of wrists?
 


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