Includes a color comparison chart in every box. If test remains purple, the oil is safe. It if turns yellow, acid is too high. ETK™ Test Kit for use with Polyol-ester (POE) lubricants. Tests for acid contamination in the compressor's crankcase which can be indicative of lubricant decomposition. One bottle test kit is a simple and cost effective method of determining whether the acid level is within an acceptable range for mineral or alkyl-benzene lubricants. Simply fill the bottle with oil to the line on bottle neck and shake.
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