No doubt Compass had great detectors in its day, Scanner series had several types with an ID analog meter.
Vari-Filter = John Earl (CoinScanner with preset GB and GoldScanner Pro with manual GB)
Vari-Filter = John Earl (XP-Pro and XP-Pro Plus)
2-Filter = George Payne (CoinScanner Pro with pre-set GB and 3-tone)
2-Filter = Steve Gross (CoinScanner Pro II with manual GB and 3-tone)
The CoinScanner Pro II in the video is a Steve Gross 2-filter 3-Tone model. Although it does well with Monte's nail test, the Vari-Filter models are better separators in iron and handle tougher mineralization. The 2-filter Scanner series, are more of a coin hunter due to the tones and have a slower recovery speed.
The original CoinScanner was a single tone Vari-Filter preset GB, followed with the 2-Filter CoinScanner Pro 3-tone preset GB, then the 2-Filter CoinScanner Pro II 3-tone with manual GB.
All good models, I know a bit confusing hope I got it right. Have all of these model's and still to this day use them, scored my first gold coin with a GoldScanner Pro series.
Paul