DC shunt used to measure amperage draw on starter in conjunction with a VOM/multimeter. Briggs number, as I recall, starts with 19.
Haven't used one in a long time since I got a clamp on ammeter. Best I remember the thumb screw end clamps over the neg post of a 12 volt battery. One test lead from pos battery post to ground on starter, the other test lead from end post of shunt to starter post. Attachment of VOM to red and black posts is straight forward.
Am I close, Slapper?