record wear increases and sound quality deteriorates with the tracking-angle error. i mean, scratch DJs are probably doing many things anyway that are neither good for your records nor for the fidelity of the audio. so why would you bother about tracking-angle errors?
but for me personally (i don't scratch), i think the gauge is worth it. if you don't get it, at least try to make sure that the distance between the plug of the headshell and the stylus tip is close to 52mm. also, if you imagine a straight line between the two headshell mounting screws, that line should be perpendicular to the headshell.
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