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Certified Pre-Owned Gas Detectors

Get the world’s most reliable gas monitors at an exceptional value. Every Industrial Scientific Certified Pre-Owned (CPO) gas monitor gives you virtually all of the durability, reliability, and dependable performance of a brand-new gas monitor. 

You can rest assured that the gas detector you receive has been scrutinized to the high standards you expect from Industrial Scientific.

Rigorous, Multi-Point Inspection

Our CPO gas detectors pass a rigorous multi-point inspection, including intrinsic safety approvals, so you can rest assured that your equipment has been scrutinized to the highest standards. We certify our CPO monitors after they pass a factory inspection checklist, so all components perform as originally designed.

Shop Certified Pre-Owned Gas Monitors


Ventis® MX4

The robust, multi-tasking, personal four-gas monitor that goes where you go.


Tango® TX1

The single-gas monitor that increases worker safety and reduces overall costs.

GasBadgePro 2

GasBadge® Pro

The single-gas monitor that provides a lifetime of gas hazard protection.


MX6 iBrid®

The most adaptable six-gas monitor on the market.

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Download our brochures to see specs, pricing, and more for our Certified Pre-Owned gas detectors.


Certified Pre-Owned Gas Detectors - US Dollar


Certified Pre-Owned Gas Detectors - Canadian Dollar