Blue-White Flowmeters / Rotameter
Blue White Industries manufacture a wide range of flowmeters.
Most variable area flowmeters (rotameter) have a dual scale of GPM and LPM and they can be available inline or panel mount.

Model
Flow Range
F-300
5 to 1900 GPM
F-440
.025 to 5 GPM
F-450
0.1 to 10 GPM
F-451
.5 to 40 GPM
F-452N
2 to 175 GPM
F-550
.025 to 60 GPM