OD90 vs OD135
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The two photodiodes on the eVOLVER are at 90 degrees and 135 degrees from the IR LED.
Try OD135 for OD600 < 0.5
There will likely be vials that max out between OD600 0.5 and 1.0
Try OD90 for OD600 > 0.5
Some eVOLVER systems are able to read OD90 up to OD600 of 4 or 5
This may require optimization of the internal resistor pack
Switching between currently requires (can be applied to an existing GUI calibration you have on your eVOLVER)
See forum post for an example