For the semiquantitative determination of total petroleum hydrocarbons (TPH) in soil and water. Please note that this reagent set has changed starting in January, 2017. The antibody cuvettes will now come as 12-mm tubes. For these new tubes, the analyst will need to order a new 8 position tube rack with part number 4879910. If the analyst is utilizing the PCII (pocket colorimeter II) for the TPH test, you will also need a new cell adapter with part number 5954610.