Worn on an armband, the BodyMedia SenseWear device contains a number of sensors: accelerometer to measure activity levels and steps taken, galvanic skin response (the only highly mobile, relatively inexpensive, device that I've seen that does this), skin temperature, and "heat flux" (amount of heat dissipating from the body). It can hold 28 days' worth of data and the raw data can be downloaded in Excel format. So it can be used to measure energy expenditure, step count, time spent in varying levels of activity (sedentary, moderate, vigorous), and sleep parameters (time lying down, sleep duration, sleep efficiency).They also have analysis and visualization software. Each device is $500 but a sales rep told me they offer quantity discounts: for quantities of 10-19 armbands, you get a 10% discount off list. If you order > 20, then you receive a 20% discount and the next discount applies for quantities of 50 or more. A bit expensive but it measures a lot. This product is promoted to clinicians and so is probably reliable; plus it has a great number of professional abilities and tools (e.g., you can configure channels for higher or lower sampling rates, etc.).
BodyMedia SenseWear: http://sensewear.bodymedia.com
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