The Fowler 1" diameter X-Test test indicator set includes a balanced dial test indicator with a 0.060" measuring range, 0.0005" graduations, a revolution counter, a jeweled movement with an auto-reverse mechanism, a 210-degree swivel rage, two dovetail mounts and a stem mount, and is designed to measure surface variations in narrow or recessed areas. The 0-15-0 balanced dial has a revolution counter and a total measuring range of 0.060" with 0.0005" graduations. An adjustable bezel and dial zeros the reading at any location. Jeweled bearings and an auto-reverse mechanism provide smooth lever action. Three interchangeable tungsten carbide contact points have 0.5 " length and 0.040", 0.080" and 0.120" ball diameter for use on a range of surfaces, the contact points swivels 210 degrees to reach a variety of locations. Carbide contact points provide durability for surfaces with a hardness rating below that of carbide. Two dovetail mounts on the front and back of the indicator and a stem mount on the top allow the indicator to be mounted from the top, front and back. The axial support has three hinges and a positive locking mechanism using three hex screws that provide stable locking in a variety of positions. This product comes with full one year warranty on material and workmanship offered by Fowler, an American company. If you experience any issues contact company directly for the warranty claims. The set includes a Fowler 1" diameter dial test indicator, Three contact points(ball diameters 0.040", 0.080" and 0.120"), a contact point wrench, a contact point case, an axial support, a height gage bar and clamp, two adaptor sleeves and a fitted storage box. Dial readings with three digits, 0-10-0 for example, signify that the indicator has a balanced dial. Dial readings with two digits, 0-100 for example, indicate the dial has a continuous dial. Balanced dials are used for reading the difference from a specific surface reference point. Continuous dials are used for direct readings and usually have a larger measurement range than balanced dials. Test indicator gages, also called gages, are precision instruments that measure short linear distance. They are commonly used for detecting deviations from tolerance limits, such as small variation in flatness or height of an inspected workpiece and permit measurement in narrow grooves or small bores. Fowler High Precision manufactures inspection and measurement instruments, such as electronic indicators, calipers, bore gages and digital scales. The company, founded in 0946, is headquartered in Newton, MA, USA.