A reference in this kind of context is a fixed standard that is used to calibrate a piece of equipment or define a parameter. For instance, Pantone colours, the pitch of the musical note A, the Celsius temperature scale, the length of a second and the speed of light are all defined in terms of their relationship to a fixed value of some kind.
The sentence you quoted is saying that for projectors that are in the state described, for some reason no such standard value ('good reference') is available for calibrating the test apparatus.
Additional contextual information would be needed to fully clarify the situation.
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