Checking Anti-Skate?

Does anyone know of an anti-skate measuring device? Years ago, I obtained an "unpressed" LP. No grooves. This would allow me to put the turntable in rotation, lower the tonearm, and basically watch whether the tonearm would skate in either direction on the vinyl surface. I would make anti-skate adjustments accordingly until the arm would remain stable. It worked.

Then, I lent it somebody. You know that story.

Is there something out there I don't know about that would allow me to fine tune anti-skate?

I use a DB protractor for cartridge alignment, a Shure stylus pressure gauge, and a laser for setting VTA.

Help me out here guys, Thanks.