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This is a solid instrument. Filters have been change and flow rate has been check. Battery was tested to 10 hours run time. CO, H2S, Combustible, and O2. Passes Calibration easy. We can ship next day to a job site. We have phased this model out of our fleet. Instead of just sitting on our self I thought it could help someone in a pinch. If needed, we can print the Calibration report off of the instrument, be sure to let us know. Have any questions let me know.
Or if you have an ALTAIR 4X, 5X, 5X with PID that needs servicing let me know, $110and comes with calibration cert. We have around 60 in our fleet of rentals, so I am very formulary with the instrument. Just let me know.