Direct Reading flow tube scales are designed exclusively for a specific gas or liquid at a given temperature and pressure valid only for the associated units of flow. Easy-to-read flow rates for a specified set of parameters are clearly indicated in specific engineering units, such as mL/min or scfh. Meters with these scales are user-friendly. The inconvenience of having to use correlating tables and graphs to determine flow rates is eliminated. NIST traceably calibrated for specific liquids and gases, these units are ideal for OEM applications and processing industries. Direct Reading Scales are available for argon, carbon dioxide, helium, hydrogen, hydrogen chloride, methane, nitrous oxide, oxygen, and propane. Quick shipping of these Direct Reading Scale Flow Meters is available.