I am now an official beta tester for the Gamma Scientific flexOptometer
. Looks like this:

(Image credit: Gamma Scientific
)
I also have a set of neutral filters, sensor and matched filter.
Tested the computer interface, it uses the same FTDI chip as the Arduino, so I plugged it in and used screen to talk to it:
Initial tests with the super-bright Marinemaster and dim-tritium-based Luminox 6402 Blackout are quite promising - we can do this!
Next steps - construct the beamline, then its time to write some Python to automate the collection of the data.
My deep thanks to Gamma Scientific for letting me beta test this photometer.
