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woop said:so where can you get a laser sensor like the one shown?
the same thing could be done (without the extrapolation feature) using a lcd voltmeter like this one:
http://www.dse.com.au/cgi-bin/dse.storefront/4744cc7709ca2e36273fc0a87f9c06ed/Product/View/Q2220
and a resistor voltage divider, which you could calculate if you know the output of the sensor in mv/W and the input of the lcd, which for this one is 200mv (it will display 1999 for 199.9mV)
unless you wish to test different sensors or use the extrapolation, i think for a diy meter, this will do