Our 555 Ethylene Oxide Monitor is the most convenient way to measure personal exposure to ethylene oxide gas. Employees who work with EtO should be regularly monitored to maintain a safe working environment. This easy-to-use badge can collect 15-minute STEL samples as well as full-shift, 8-hour TWA/PEL samples.

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Item Description List Price

Box of 5

w/ Analysis

X555AT Prepaid for Ethylene Oxide $227.00Get 10% Off


w/ Analysis

W555K Prepaid for Ethylene Oxide $64.00

No Analysis

M555AT 30 media wafers in a vial for lab use. $99.00
N555AT 10 monitors $285.00Get 10% Off


Ethylene oxide is collected on a flexible, inert charcoal wafer treated with hydrogen bromide.  The hydrogen bromide converts ethylene oxide to 2-bromoethanol.  At the lab, the excess hydrogen bromide is neutralized with sodium carbonate.  Then, the 2-bromoethanol is extracted with 90/10 toluene/acetonitrile and analyzed by GC/ECD.  No further derivatization is required.

This badge collects the following:

Ethylene oxide

More Information on the Sampling Guide.

Special Notes

Note: The sampling rate of the 555 changed with Lot 7F15, July 2015.

Tech Doc


Before sampling, store and ship at room temperature.

After sampling, store and ship at room temperature.  Return to the lab within 14 days of sampling.

Use For

The 555 ethylene oxide badge may be used for:

  • 15-minute STEL sampling
  • 8-hour TWA/PEL sampling
  • 24-hour IAQ sampling