Hello all, I have a customer that has air conditioned their large warehouse. Since then, they are getting employee complaints about propane smell. Their older Yale forklift is still equipped with a gasoline carb and an Impco mixer in the air cleaner hose that at one time provided a dual fuel machine. I feel that converting to a true Impco LP carb would help lean the exhaust, but the customer has also asked if I can test the emissions before and after the repair to see any improvement. I've had no luck borrowing one, and don't want to break the bank on such a limited need. Can anyone suggest a low cost tester?