Designing a very low power device?

Need to measure picoamps? If you are developing embedded hardware that requires very low power, you need to accurately measure the current drain from standby up to its peak during normal operation. But what measurement device can you use? Many solutions to this challenge have ranged from very expensive ammeters costing thousands of dollars, to cheaper solutions that only have limited manual ranges. Even if you have an expensive six-and-a-half digit multimeter that promises one nanoamp resolution, the lowest current range is usually two milliamps and the absolute accuracy is plus-or-minus five hundred nanoamps. That is not good enough!

 Take a look at these products! Electron Plus SPA100 Source Picoammeter

http://www.saelig.com/electron-plus/spa100.htm 

 and 

RBD Instrument's 9103 USB Picoammeter 

http://www.saelig.com/picoammeters/9103.htm