Bios Defender 520M (0.05-5LPM) by Mesa Labs Bios °C / °F Click here to verify the

Click here to verify the right Adapter Kit for your Respirator

HVAC system verification

The monitor housing uses industrial-grade plastic with toughened glass for drop and impact resistance

Used for span calibration and bump testing of NO₂ sensors on portable gas monitors

Additional measurements include relative humidity (0–100%

Bios Defender 520M (0.05-5LPM) by Mesa Labs Bios °C / °F Click here to verify theThe Bios Defender 520M by Mesa Labs is a primary liquid free gas flow calibration standard offering a measurement range of 0. 055 LPM, providing traceable volumetric flow verification without the need for bubbles or liquids. Its pushbutton interface allows users to set engineering units, temperature compensation, and continuous or burst measurement modes in seconds, and it simultaneously records ambient temperature and pressure for a complete audit