Alicat Scientific Controllers are the fastest, most accurate, and cost-effective mass flow controllers on the market. Can be used to measure gas flow from 0.5 SCCM to 5,000 SLPM, with accuracy to to ±0.5% of reading or ±0.05% of full scale and a measurement range of 0.01-100% (10,000:1 turndown). NIST traceable calibration. Lifetime warranty. Made in the USA.