Tareq El-Hasan posted an answer for this Microlife 3AC1-PC Blood Pressure Monitor:
"Three main causes for Err 3: 1. Air leakage===> check cuff, air outlet socket 2...."
Tareq El-Hasan posted an answer for this Health & Beauty:
"i did have the same problem..and i resolved it..but before i give you the solution..do you..."