AlicatWhisperFlowMeter
From Jimenez Group Wiki
The Whisper Series features extraordinarily low pressure drops, as low as 3.6 mbar (0.052 psi) at full scale, or 0.018 mbar when fully turned down (200:1 turndown). Low pressure drop means minimal system impact, resulting in faster mass flow measurement (<10 ms) and control (<100 ms).
Things to remember when using these flow meter
1) Do not over pressurize them (max = 60 psi)