I have this Valuable and reliable Industrial Scientific Model: MG140 four gas monitor, O2, LEL, CO and H2S  Refurbished and 100% working good and recently calibrated.

The unit was purchased on: 11/2007 directly form Industrial Scientific Authorized Service Center and it was barely used.  All Sales Are Final.

Accessories Included:

1- MG140 Unit S/N: 06060RW-032

1- Pump Assembly S/N: 0310250-024

1- Charger

1- User Manual

Detailed Description

4-gas monitoring for O2, LEL, CO and H2S One-button calibration Ni-Cad or Alkaline battery packs Two-year warranty The MG140 is designed to be a reliable, low-cost gas monitoring solution in applications where the flexibility of a full-featured multi-gas monitor is not required. The MG140 continuously monitors the air and displays the concentration of oxygen, combustible gas, carbon monoxide, and hydrogen sulfide. A 90 dB audible alarm and ultra-bright visual alarm alert the user that gas concentrations have exceeded the preset limits. A high visibility, enamel coated stainless steel case provides the MG140 with the durability found in every gas monitor carrying the Industrial Scientific label. The MG140 instrument and SP100 sampling pump carry a full two-year warranty.