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Amazon.com: Multi Calibration Gas: 25 PPM Hydrogen Sulfide, 100 PPM Carbon Monoxide, 2.5% (50% LEL) Methane, 19% Oxygen, Balance Nitrogen (29 Liter) : Industrial & Scientific
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Gasco 58L-386 Precision Calibration Gas 35 ppm Carbon Monoxide, 10% LEL Methane, 19% Oxygen 58 Liter: Amazon.com: Industrial & Scientific
SENSIT, Carbon Monoxide/Combustibles/Hydrogen Sulfide/Oxygen, CO/H2S/LEL/O2, Personal Monitor, 4 Gas - 35ZD22|925-GRNGR-40 - Grainger
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MSA Sirius Multigas Detector Kit Includes PID with 10.6 eV Lamp (0-2000 PPM), 0-100% LEL, Oxygen (0-25%), Carbon Monoxide (0-500 PPM), Hydrogen Sulfide (0-100 PPM), Lithium Ion includes Charger & Cord, 10
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Norco Norlab NLBZ105310PM4 Multi-Component Calibration Gas, 10 ppm Hydrogen Sulfide, 300 ppm Carbon Monoxide, Methane (58% LEL), 15% Oxygen, Balance Nitrogen, 58 L - Premier Safety
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