I suggest that you contact the iMac manufacturer's to see what blood glucose meters they suggest to use. They know their product best!
One contact I suggest follows; I always use the manufacturer for such questions: call 1-800-MY-APPLE
* Type 1 Diagnosed for 57years as of Nov 2014 * 50 Year Type 1 Medalist Award from Joslin Diabetes Clinic (Harvard Medical School) * Medtronic Paradigm Revel 523 insulin pump as of March 11, 2011 * Insulin: Humalog * Food Allergies: milk, yeast, corn * Hashimoto's thyroid disease * A bit of arthritis * One kidney due to benign Angiomyolipoma. * Volunteer Community Disaster Co-Coordinator * Hobbies/Interests: Wildlife Naturalists, artist, gardening, music
I have only ever used a Mac and had the same problem for a long time. Now, there are two solutions. You can use a virtualizer package such as Parallels or Boot Camp that will permit you to use your Mac exactly like a PC. My guess is that most meters nowadays are compatible with PCs rather than with Macs. The second solution is to use the meter that I bought about 4 months ago. It is made by Bayer and works well with my Mac (MacBook Pro). It has its own software that is downloaded and is available for both Macs and PCs. The meter itself is just like a USB flash memory drive and it plugs directly into a USB port on your machine. The spreadsheets are wonderful and provide a vast amount of information.
So, as a starting point, look for a meter on the Bayer website. I hope this helps.