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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.

Get in the Express Lane today for monitors that ship tomorrow!

Select Ventis® MX4, MX6 iBrid®, and GasBadge® Pro monitors are in stock now and available for shipment within one business day*. 

Ventis® MX4 Multi-Gas Monitor
  • Certified Pre-Owned Diffusion Ventis MX4, Li-ion Battery w/Charger - O2, LEL, CO, H2S
  • Certified Pre-Owned Aspirated (pump version) Ventis MX4, Li-ion Battery w/Charger - O2, LEL, CO, H2S
MX6 iBrid® Multi-Gas Monitor
  • Certified Pre-Owned Aspirated (pump version) MX6 iBrid, Extended Run Li-ion Battery w/Charger - O2, LEL, CO, H2S
GasBadge® Pro Single-Gas Monitor
  • Certified Pre-Owned GasBadge Pro - H2S

*Contact us for additional products or quantities greater than 25.


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.

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