The Mesa Labs Defender 510 Volumetric Primary Flow Standard Calibrator, base model of the Defender Series, featuring DryCal technology. Ideal for: personal sampling pump calibration and volumetric flow calibration. Available from CleanAir in Low (5-500 ccm) flow range configuration. Each factory-calibrated instrument includes ISO-17025 NIST-traceable certifications.

All Defender Series products offer single, continuous, and burst reading options. Connect your computer to the Defender’s RS-232 port for real-time flow and data capture using DryCal Pro Software.