I use the Marell Digital Level on the Pro2 with great results until it started acting up : the picture was breaking up, kinda like a bad BNC. The bubble wouldn't work well and then I got nothing on the monitor.
I shot an email to Marell and Dave Ellis got back to me right away. There is a tiny hex screw below the power Lemo plug. It is adjustable. A little fiddling and the bubble was back up and running. This screw is a capacitor, it adjusts the line locked clock - phase lock loop - frequency lock point.
You must be extremely careful with the hex screw though.
I want to say here that not only the Marell products are top notch (I use to use the high brite CRT), but their customer service is also way up there.
Marell Electronic Level
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