I've been using the "direct SRA observation" approach for some time but found another method applicable to cartridges NOT YET installed on a tonearm: 1) use a microscope to first measure the angle between the cantilever and the line of contact on the stylus tip, say 110 degrees, 2) install the cartridge and apply normal tracking force, then place the stylus on the record surface, 3) use a smart phone or camera to take a close-up picture and measure the angle between the cantilever and the record surface, say 22 degrees, 4) using simple math, one can derive 180 - (110 - 22) = 92 degrees of SRA.
Overall, observing the cartridge's stylus before installation, then taking a picture of the cantilever on the record surface and measuring the angle between the two is relatively safe and easy, compared to observing the SRA directly.
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