Snap-on Diagnostic's Hand-Held 5-Gas Analyzer, No. HHGA5B, supplies precise readings for both pre-emissions testing and vehicles that have failed emissions tests. This emissions analyzer provides an instant assessment of the engine and catalytic converter when hooked up appropriately. The tool can be used independently or linked to a Verus, Verdict or Modis diagnostic platform. It takes five gas measurements including oxygen, carbon dioxide, carbon monoxide, hydrocarbons and nitrogen oxides emissions. It also benefits the user that it is fully portable as it can be used anywhere in the shop or on the road, using either AC or DC battery power.