BX2200 -- What is this beside the hour meter?

[JWR]

Just to the right of the "1/10" explanatory printed mark beside the hour meter is a tiny window with a small vertical white mark that seems to alternate from white to black (or gone) when the engine is running. It is not fast but kind of blinking on and off and on ... maybe 2 or 3 seconds between on and off.
Is it by chance an indicator that the hour meter is working?

The Operators Manual barely mentions the hour meter and does not provide any hint as to what this extra marker is.

 

[MossRoad]

Yes, it just shows it's running, I believe.

 

[BravoXray]

Yeah, and I think it shows 1/100ths of an hour.

 

[ruffdog]

It means the meter is running.

 

[JWR]

I went out this evening and fired up a second BX2200 of my own (the one I had been asking about was my daughter's) and it is the same. Surely you guys are correct -- that it just indicates the meter is running. BravoXray - no it does not show 1/100 of an hour. I did time it and the white vertical mark shows up roughly every 5 seconds while the engine is running.

I guess we beat this one past death. Thanks all.