Gilian Air Sampling Pumps and Calibrators
The World’s Most Trusted Air Sampling Pumps

GilAir® Plus Personal Air Sampling Pump
The Widest Flow Range of Any Personal Air Sampling Pump (1 – 5,100 cc/min)
QuadMode™ Air Sampling Technology
Performs both high-flow constant pressure and constant flow (450-5,100 cc/min) and low-flow constant pressure and constant flow (20-499 cc/min) with a single pump.
Selectable Automatic Fault Recovery
Ensures sample integrity by attempting to restart the pump in case of fault conditions.
Standard Temperature & Pressure (STP) Correction
Provides accurate flow rate and volume measurements under varying environmental conditions (STP model).
Superior Design & Comfort
Compact and lightweight design (one-third smaller than traditional pumps, weighing less than 21 oz.) maximizes worker comfort during extended sampling periods.


Gilian Go-Cal Pro Air Flow Calibrator
The Only Air Flow Calibrator with 1% Accuracy Across the Entire Three Flow Ranges
Stability Monitoring
View percent deviation readings to ensure consistent flow throughout your sampling process.
NIST Traceable & Certified
The Go-Cal Pro is NIST traceable and certified within Sensidyne’s ISO 17025 laboratory, guaranteeing the highest level of measurement confidence.
Ergonomic Design
The handheld form factor and intuitive user interface allow for effortless operation and data entry, even in challenging conditions.
Simplified Setup
Quickly calibrate your air sampling pumps with minimal setup. Simply connect the tubing and activate the pump.
Gilian Air Sampling Pumps and Calibrators
As the U.S. Master Distributor of Gilian air sampling equipment, OHD is proud to offer a full line of personal and area air sampling solutions, including:


Gilian Dustlight Personal Dust Monitor
Real-Time Respirable Dust Exposure Monitoring.
Ultra Light & Wearable, Built for Industrial Environments.
Real-Time Monitoring
Provides instant feedback on air quality, allowing for immediate awareness of dust levels.
Traffic Light System
Offers an intuitive color-coded warning system (green, yellow, red) for quick assessment of dust concentrations.
Modular Mounting (Klick-Fast system)
Versatile attachment options for clothing, belts, and other accessories for comfortable, secure wear.
Data Logging & Analysis
Records measured dust concentrations for trend analysis and allows for data export via the mobile app.

Transform Your Air Sampling Program Today
Gilian air sampling equipment is known for being dependable, rugged, and able to perform to the highest standards required by industry professionals. Ready to experience the difference? Contact us to learn more!