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The FlowMarker™ is a portable, lightweight fogger for a wide variety of flow visualization applications. Generating fog at ambient temperature, the FlowMarker™ does not serve as a heat source and does not cause air to rise, but its fog follows the natural undisturbed movements of air. Unlike traditional smoke sticks, the FlowMarker™ fog is nontoxic, germ-free, and does not promote growth of organisms.

Tamper Proof

Only certified pure FlowMarker™ fluid can be used for refill, providing assurance of contamination-free testing.

Hydra System

FM-Hydra Tube© System extends application range with a 5m hose nozzle

Specs & Details

  • More accurate airflow evaluation
    Detect and “mark” air currents, without creating disturbances.
  • Fast
    Visualize turbulence, directionality, and potential dead spots with the touch of a button.
  • Eliminates risk of contamination
    Fog is non-toxic, bacteria-free, and breaks down completely into carbon dioxide and water.
  • User-friendly
    Lightweight, small, and portable design allows operation in places that are awkward or hard to reach.
  • Proven
    Successfully used in a wide range of demanding applications, including pharmaceutical development, electronics cooling, room ventilation, animal cage environments, clean rooms, and wind tunnels.
  • Tamper Proof
    Only certified pure FlowMarker™ fluid can be used for refill, providing assurance of contamination-free testing.
  • From the Airflow Experts
    Used in conjunction with degreeC’s precision air velocity sensors, the UAS-series, the Flowmarker II™ is a perfect companion tool to visualize the flow profiles under study.
  • Flowmarker II™ Instrument Weight: 2.5 kg [5.5 lbs]
  • Flowmarker II™ Dimensions: 210 mm x 90 mm x 135 mm [8.3” x 3.6” x 5.3”] 
  • Battery (Supplied): 12 VDC / 2Ah Pb rechargeable
  • Battery Charging Time: 14 hours
  • Fog Fluid Capacity: 16 mL [0.54 oz]
  • Fog Fluid Composition: Propylene Glycol – FDA GRAS
  • Fluid Consumption: 
    • 0.7 mL/min [0.02 oz/min]
    • Operates 20 minutes continuously with full fluid reservoir
    • 420 cycles, 3 seconds each
    • Auto power-off after 4 minutes without activity
  • Warm-Up Time: 20 seconds
Package details

The Flowmarker II™ comes in its own transport case and contains:
  • Flowmarker II™ Device
  • Application Tube
  • Rechargeable Lead Acid Battery 12V DC
  • Battery Charger (International)
  • Tool for Removing the Condensate Rings
  • 5x Pieces of the Condensate Ring (large)
  • 5x Pieces of the Condensate Ring (small)
  • 1x Aerosol can of FlowMarker-Fog Fluid
  • Instruction Sheets: Repair & Tank Overfilling
  • MSDS Data Sheet
Normal lead-time is 2-3 business days. Some accessories my have longer lead-times.


Data Sheet (FlowMarker™)
Manual (FlowMarker™)
MSDS (FlowMarker™)
Data Sheet (Hydra System)
Manual (Hydra System)

Flowmarker Accessories

FlowMarker Replacement parts

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