01-04-2016, 22:45
Thanks Alan. That's the sort of guidance that I'm after. I wish we could buy the sensors cheaply in Australia rather than having to buy the complete unit and then just using the sensors. I note that we can buy the sensors from AliBaba ( http://www.alibaba.com/product-detail/Pr...21428.html ) but there is a minimum purchase of 50 units. I wonder what the price per unit would be though.

