thx you every one for the help,my left arm is 17" when its hanging straight down and fits in the cuff in that machine ,the read on the machine is good ,what it was when i went to the doc a few months back ,its this stupid wrist pressure monitor ,its a peace of shit!!!! ,i used it on my friend and he was just at the doc and his BP was better than normal .when i tested him with the wrist crapper his bp was 160 102 ,we both laughed and i new this wrist monitor was crap ,then i went to the pramacy where they had the other machine and where i bought the wrist monitor and ask the parmacist if it was reading correctly ,and told her what it was reading for me and ,she said that the wrist monitor was crap [not in those words LOL] and the machine was a much better read even though my arms r not 13" "LOL" so i took a read and it was at first 128 74 then 3 mintues later it was 119 66 ,but that wrist crap will say 144 101 ,ill go with the machine in the store any day ,im getting my $ back ,dont use the wrist monitors it will cause you to freak out like i did for the last 2 days ,lol thx again all for your help JROXXX