These field test kits can be used to assess the amounts or levels of organophosphate or carbamate pesticide residues in agricultural commodities such as grains, fruits, and vegetables using a sensitive detection method. It determines the tolerable levels of pesticide residues without the use of sophisticated equipment. The kits are very handy and can be used right in the field or in the market place. The results can be obtained in five minutes, thus recommendations may be done on the spot. The kits are also cheaper than the usual method of analyzing for pesticide residues. Farmers can therefore put a premium on their crops that were screened for pesticide residues using the test kits.