Snap on something?

When properly working (with proper proprietary connection leads) the scope can measure distributor dwell, show you the condition of the coil and distributor bushings, show you "reserve" coil voltage (voltage above firing voltage) will show the condition of plugs and wires, and notice "cylinder balance." This is an electronic delay gate that pulls down the dwell on one cylinder and kills one cylinder at a time (selectable) You can then measure RPM drop in each cylinder. There are a number of other things that can be done depending on the instrument, I'm not familiar with that exact unit

The list at upper left says something about alternator. I'd guess at least it can measure charging / system voltage, and possibly amperage. Commonly, these would come with an adapter/ shunt fitting that fit between one battery post and cable (series) and in some cases could measure starter current as well.

Normally there are clips to the battery, and a clip to coil NEG
A clip that fits around the dist HV wire, and an adapter that goes into the no1 dist tower Others, depending on model

I think I can read something says "timing advance" so it should have a timing light with it as well