What was the best gadget you’ve ever made or worked on?

Question: What was the best gadget you've ever made or worked on?
- Keywords:
  achievement,
  invention,
  work
Asked by to James on 24 Jun 2014. This question was also asked by .
- James Taylor answered on 24 Jun 2014:
  
  Hi Ribrahim,
  
  I don’t make gadgets , I just try to work out how to use them in agriculture (electrical and mechanical engineers make gadges, which makes them just about my best friends). The gadge i liked best so far was a nanotech water sensor. It was so small you could put it into the stem of a plant and measure the water flow in the plant (Gives great information on when to water the plant next). Very cool piece of nano-engineering.

Question: What was the best gadget you've ever made or worked on?