Question: have you made any sensers that are on the market today???

James Clarke answered on 4 Nov 2016:

Unfortunately not yet! I work as a researcher at a University, and that means most of my work is coming up with new ideas for sensors and making one or two of them very quickly. If they’re good, then companies may “buy” the idea, which gives them permission to make and sell them. So maybe in future (if my research goes well) it’ll be available in the shops!