2 kits - Covita 20ppm Carbon Monoxide Calibration Kit  Retails for $200 each

I was told these are new. I don't know the history so I can't say for sure. 

One the regulator and hose are still sealed in the bag so I'd say that one

has never been touched. The second has had it's regulator and hose attached. 

The regulator still reads about 450 on the gauge. Almost all the way. 

If you have any questions, please ask. 

No shipping to PO boxes, Alaska, HI or PR

These will need to be shipped fedex ground.