Calibration Gas for ALL RKI Instruments Portable Gas Monitors.
Size: Chose from 34, 58 or 116 Liter Size Refillable Bottles
Concentration: 12% O2, 25 ppm H2S, 50 ppm CO and 50% LEL Methane (2.5% Vol)
Shelf Life: 24 Months
These are the Special “PortaGreen” Refillable Cylinders. It even includes a return shipping label.
PortaGreen provides a hassle free cylinder return program designed to reduce HAZMAT costs and your carbon footprint.
- Eliminates HAZMAT Liability
- No Disposal or Return Fees
- Reduced Cylinder Footprint
- Increased Shelf Life
- Easy To Return
- All blends available
Here is a link to learn more. http://www.portagas.com/products/portagreen/