The H.01L oil / water interface meter is used to accurately measure the thickness of floating product (LNAPL) above the water table. It will also detect and measure sinking layers of DNAPL. The H.01L with its slim probe 5/8in (13mm), is ideal for wells, piezometers and direct push equipment as narrow as 3/4in (19mm) ID. The probe and tape will withstand hydrocarbons, solvents and other contaminants. This unit is used by professionals involved with the monitoring and remediation of groundwater contaminated by oil products. The H.01L interface meter is suitable for wells, boreholes, underground and above ground storage tanks.