The AMS Interface Meters provide measurements of both floating and sinking hydrocarbons (non-aqueous product layers). These battery powered, portable reel-mounted instruments uses include measuring oil and water levels in monitoring wells and detecting tank leakage. When the probe of the interface meter is lowered down a well and contacts the product layer, a solid tone and green light alarm is activated on the reel. When the probe detects water, the tone begins to oscillate and the light changes to green. The 100-foot Kynar-coated measurement tape has a is marked in engineering (standard/English) or metric unit increments. The 5/8-inch diameter probe is equipped with stainless steel conductors and stored on a rugged polypropylene reel with an aluminum frame. It is shipped in a padded carrying case.