Test setup:
For this test you will need free weights of various sizes, a harness, carabiners, and a sling/load pin to add weight to yourself.
The test uses 20mm edges. Preferred hangboards for this test:
Tension Grindstone & Grindstone mk2 (edges marked as 20mm)
Beastmaker 1000 (bottom outside corners)
If one of these is not available, do your best to find an edge close to 20mm, and report the hangboard used. It’s fine to use a different edge size, just make sure you use the same edge when you re-test later.
Perform this test after 2 sleeps of rest since your last climbing session. Warm up thoroughly. Use an interval timer app set to 7 seconds. Film yourself or have a friend film you so you can see your form.
Rest 2-3 minutes between hangs, and add weight progressively to each hang. Take 5 attempts to hit your max. If you let go before the 7 seconds is up, the rep is a failure. Report the highest successful load.
* I know adding lots of weight is unpleasant. If your max exceeds +? bodyweight, report that load and ask for more specific testing.