TopTes Guard-101 4 Gas Detector — Best-Value O2, CO, H2S, LEL CO600 For an overview of how

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TopTes Guard-101 4 Gas Detector — Best-Value O2, CO, H2S, LEL CO600 For an overview of howEDITORIAL REVIEW: 4. 4 5 WC Safety Review of the TopTes Guard 101, the best value entry 4 gas detector. Editorial assessment by Steven Eaton, WC Safety editor, based on published TopTes specifications and category fit. We did not laboratory test this product. The TopTes Guard 101 is the best value pick in the TopTes line a rechargeable four gas detector reading oxygen, combustible LEL, carbon monoxide and hydrogen sulfide with triple alarms, a 14 hour