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Both of these gas monitors are sold as is for parts or repair. These monitors were in a mechanic’s tool box that I bought. I have no way to test these items.
MSA ALTAIR 4XR 10178557 Detector Multi Gas Meter (LEL, O2, CO, H2S)
$750.00
MSA Altair 4X Gas Detector Monitor With Charger Turns On **
$250.00
MSA Altair 4X Multigas Monitor Detector Meter With Charger Safety Equipment
$279.99
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