A Professional tracking force gauge designed for vinyl record enthusiasts interested in precise measurement of vertical tracking force (VTF). For accurate VTF measurement, the stylus tip should be at the same vertical position as the record surface at "record level". The Riverstone VTF gauge measures vertical tracking force approximately 2 mm to 3 mm from the surface of a turntable mat or platter, matching the height of a stylus tip resting on an LP record, which typically ranges from 1.9 mm to 2.9 mm in thickness. The gauges design allows use without removing the platter mat, ensuring correct stylus height during measurement. Inexpensive gauges often measure stylus tip force at distances between 6 mm and 10 mm, leading to inaccurate readings. To minimize interference with magnets in MM and MC cartridges, the gauge body is made from durable plastic, and the detachable cantilevered extension arm is constructed from non-ferromagnetic stainless steel. Two calibration masses (5g and 20g) are included for quick recalibration, which can be completed in about one minute. With larger optional calibration weights, the gauge can be recalibrated for use up to 100 g. A polymer pad on the measuring platform protects the stylus tip and aids in precise centering. The bright green LED display is clear and easy to read. A comprehensive instruction manual is included. Overall dimensions: 52 mm (W) x 91 mm (L) x 12.0 mm (H), measured with cover removed. Note: Installation of the record-level extension arm requires basic technical understanding; no tools are needed. A protective tin storage box is included. All Riverstone Audio Tracking Force Gauges are backed by a full two-year warranty. Requires one alkaline AAA battery (not included).