The Reference Gauge® was originally designed to measure Reference Indications (Holes or Notches) which are machined into Calibration Standards for various types of Non-Destructive Testing Equipment (Ultrasonics, Eddy Current, Flux Leakage, etc.). Such Calibration Standards tend to be very accurate in diameter and straightness, so the Reference Gauge® easily measures the depth of these indications, as its contact blade is equipped with an Inverted ‘V’ Edge and Magnetic Hold Downs, so it self aligns to convex surfaces, such as various diameters of Tube and Pipe.
The general design of the Reference Gauge® is identical to the Main Blade of the
Bridging Pit Gauge, however it is double the width to accommodate the Inverted ‘V’
Edge. Due to Inspector input, the Center mounting Position for the Dial Indicator is
equipped with a large 1 ½” (38mm) Cut-a-way, to permit further positioning of the blade.
The Blade of the Reference Gauge® can be used with the Bridging Pit Gauge, however
if an inspector wants an Inverted ‘V’ Edge for a Bridging Pit Gauge® System, we do offer
it as the N88-12RB (as illustrated below), and have them in stock.
The Reference Gauge® is the one Pit Gauge that will often satisfy unusual requests, as
the Blade width is double that of our other Pit Gauge Models. It is obvious when the
Inverted ‘V’ Edge is not aligned to the workpiece surface, the Blade will rock. A Knife
Edge is more forgiving to misalignment, thus the Reference Gauge® is not
recommended for field use.