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RKI Instruments 72 0290 24 __ GX 2012, 4 sensor, LEL % volume CH4 O2 H2S base, choose battery option BATTERY OPTION (See Description):D The level dependent digital audio circuit ENARC40KITFAN 4 The level dependent digital audio circuit senses noise levels above the desired threshold and compresses them to a safe decibel level or amplifies weak sounds to an audible level 3M DBI SALA Remote Anchor System 2104528 8 – 16 ft Pole $1 RKI Instruments 72 0290 24 __ GX 2012 B Alkaline and Li Ion battery packs with 100 240 VAC Charger… ……………………………………………………………… $229
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