GPT-9804
GW Instek GPT-9804 Electrical Safety Analyzer / Tester {WHSE2.29C}
It's exactly 1/4 in, which means no shimming or adjustments needed.
^ GW Instek GPT-9804 Electrical Safety Analyzer / Tester #X8094
What stands out is the straightforward 1PCS quantity in the listing.
