Testbook T1,T2,T3,T4
I'm seeing more testbooks available on ebay these days, most don't appear to be T4.
What does each version enable you to do? I know T3 would have limited function compared with T4, but how limited? Are the bonus settings worth having T4 rather than T3? Is T2 too outdated?
Also, snybody any idea what cables are required for the other models (not T4) and how much the cables typically are?
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