The small size and light weight of the Little Dipper make it the ideal instrument for "carry in" sites, shallow wells, and direct push equipment. The Little Dipper utilizes many of the tried and tested components that have made its bigger brother, the dipper-T such a popular instrument with users. The instrument may be equipped with an optional 3/8-inch (9.5 mm) (for an additional $36) making the Little Dipper suitable for use in small-diameter wells and bore holes. In common with other Heron quality meters the tape complies with US-GGG-T-106E, a recognized standard assuring you of reliable, repeatable and accurate measurements. Little Dipper water level meters come with markings in either Feet and fractions (with 1/100th-inch as the smallest marking) or Metric units (meters and millimeters) tape markings. Please specify which markings you would want. The Metric Tape equivalent to a 75 foot unit would be 22 meters (for the same price).