GASTEC Passive Dosimeter Tubes
Effortless Time-Weighted Average Monitoring
Wear a tube—get a precise exposure reading. GASTEC’s passive dosimeter tubes offer a simple and accurate way to track worker exposure over time, no pumps or power required.
Two Generation Methods for Maximum Flexibility
Both methods ensure consistent and reliable gas
delivery over time.
No power or equipment required
Recognizable direct-read scale
Wearable and accurate
Product Range Overview
Choose the Right Tube for Your Monitoring Needs
| Tube Example | Gas Measured | Range | Duration |
|---|---|---|---|
| 1D / 1DL | Carbon Monoxide | 0.4–2000 ppm | Up to 24 hrs |
| 3D / 3DL | Ammonia | 0.1–1000 ppm | Up to 10 hrs |
| 5D / 5DH | Sulfur Dioxide | 0.2–600 ppm | Various durations |
| 91D | Formaldehyde | 0.1–20 ppm | 1–10 hrs |
Why Choose Al Ghwasa Dosimeter Tubes
Discover the key advantages that make our dosimeter tubes the smart choice for workplace air quality monitoring.
Authorized GASTEC Distributor
Get 100% genuine GASTEC products with complete warranty and technical documentation.
Product & Industry Expertise
Our team understands your industry’s needs — from lab safety to field detection.
Fast Regional Delivery
Stocked and shipped locally for faster turnaround and minimal downtime.
Technical Support & Training
Get expert setup guidance, calibration support, and usage training when you need it.
Simple 3-Step Usage Guide
Prepare the Dosimeter Tube
Remove the tube from its pack and clip it near your breathing zone.
Wear During Work
Wear the tube throughout the work shift or the specified monitoring period.
Read Results
Compare the color change to the reference scale and record the reading.
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Dosi-Tube Holders
