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Kelway Conditioning Film for Soil pH Meter – 24 Pack. The Kelway Conditioning Film can be used to wipe away any impurities on your Soil pH and Soil pH and Moisture Meters. The film, which comes in a package of 24, is used to maintain your meter’s accuracy when used in the field. Very easy to use: Use a clean cloth to wipe off your meter then place the Conditioning Film between your meter’s two metal plates. Be sure to place one film on each side of the lower part of the housing. Then squeeze the film lightly and rotate a couple of times. Make sure you do not touch the metal plates with your fingers. Only use the dull side of the Conditioning Film. You can use one sheet for up to 20 uses or until the rubbing motion fails to make the needle on the meter deflect to the right when placed into the soil. Kelway Conditioning Film for Soil pH Meter – 24 Pack