Try the Omron 3 series upper arm blood pressure monitor, it is easy to use and affordable!

Features:

Includes: Blood Pressure Monitor, Wide-Range D-Ring Cuff (fits adult upper arms 9″ to 17″ in circumference), Instruction Manual, Quick Start Guide
Your BP7150 Automatic Blood Pressure Monitor, excluding the arm cuff, is warranted to be free from defects in materials and workmanship appearing within two years from the date of purchase, when used in accordance with the instructions provided with the monitor
The arm cuff is warranted to be free from defects in materials and workmanship appearing within one year from the date of purchase, when the monitor is used in accordance with the instructions provided with the monitor
The above warranty extends only to the original retail purchaser, and only to products purchased from an OMRON authorized seller who is subject to and follows OMRON's quality control standards, unless otherwise prohibited by law
This unit operates on four (4) AA batteries (not included)
The OMRON 3 Series upper arm monitor not only measures blood pressure, but also detects pulse rate, irregular heartbeats, and body movements during measurements

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Home Automatic Digital Blood Pressure Monitor 3 Series® Adult Cuff 9 to 17 Inch Desk Model