Reading a flowmeter

[PerryFamily]

Looking for the proper way to read the flowmeter on my waterloo / small RO.

The indicator is about a half inch tall.

Where do I read, the top, the bottom, or the taper in the middle?

This makes the difference of 1 GPM depending on where you read it.

Thanks in advance

[wiam]

Should be at the top

[PerryFamily]

Wiam- Thank you. I was not sure where to read it.