Hypochondriac geeks

One of Business Insider's iPhone apps of the week is a blood pressure monitor. I thought I'd see what else was available and, sure enough,  Amazon have one:

The "Customers Who Bought This Item Also Bought" section throws light on the type of people who buys this type of expensive (£119) tech-gadget in preference to a cheaper one (£9.99). They are the type people who also buy Wifi Bathroom Scales (works with Linux!), Lord of the Rings Trilogy - Extended Edition on Blu-Ray, and Microsoft Windows 7 Ultimate.