ARG
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It would have to be a lab laser. Handhelds can be somewhat stable but for calibration at that power it has to be a lab laser.
405nm also wouldn't be a good idea. Some LPM's can absorb it differently, giving different readings. IR/Red is generally best.
405nm also wouldn't be a good idea. Some LPM's can absorb it differently, giving different readings. IR/Red is generally best.