Detect Ammonia: Cost-Efficient, Accurate Detection

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A cost-efficient and accurate method for detecting ammonia in gaseous mixtures involves using Draeger tubes, which react with ammonia to produce a visible white smoke of ammonium chloride when mixed with HCl fumes. While these tubes are a viable solution, they can be expensive for home use, with a pump costing around $600 and test tubes priced at $70 each. The discussion highlights a need for affordable alternatives, particularly for home mechanics seeking to assess the efficiency of urea injectors in vehicles, as current troubleshooting tools priced at $650 are deemed too costly for casual use.
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What is a cost efficient, yet accurate way to detect ammonia in a gaseous mixture?
 
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Ammonia fumes react with HCl fumes and make a white smoke of ammonium chloride. Accuracy depends of the mixture, I guess.
 
Those Draeger tubes look like a viable solution, though it is a bit pricey for home use. The pump looks to be $600 for the cheapest version then $70 per test for the tubes.

The reason I am asking is I am wondering, with the application of selective catalysts to vehicles throughout Europe and the US, if there is a cheap way for the home mechanic to determine the efficiency of the urea injectors. $650 for a troubleshooting tool is too much for that purpose.
 

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