what are the specs for the external trigger?

The external trigger is 2.5mm jack connector

Is this bright enough to check a lawn mower engine while outside but in a shaded area?

Hi, yes, it can if in a shaded area.

Can the unit be switched to Hz instead of rpm?

No it does not. It is for RPM,FPM and the appearance of stopping rotation for inspection purposes.

Can it be used to check timing on industrial sewing machine?

Hi, it can be used to check the rotational speed of industrial sewing machine.

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