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N88-4-M Pocket Pit Gauge with dual edge (reversible) blade

The N88-4-M Pocket Pit Gauge with a dual edge reversible blade is a great multifuntional compact tool to keep handy in your pocket.

With the long blade side facing towards the surface this pit gauge can be used for all conventional applications.
However when the short blade (spot side) is used this pit gauge can be used to measure on single curvatures along the longitudinal axis.
The blades are interchangeable and can be height adjusted.
This pocket pit gauge has a spring loaded lever that makes it very suitable for fast inspection of various surfaces.

Our Pit Gauges assure compliance with vessel, pipeline, tank and OCTG specifications for corrosion and erosion depth measurement

*Possible blade orientations

  • Analog metric gauge
  • Resolution 0.01 mm
  • Range 0.0 to 12.7 mm
  • Measurement by manual pressure by plunger
  • Reversible blade long and spot base
  • Suitable for flat surfaces and compound curvatures
  • Read indicators are interchangeable with all model bridges and blades in the N88 series
  • Conforms to ASTM G46-94
  • Includes NIST- Traceable Calibration Certificate

Complete Kit

The complete kit includes:

  • Metric dial gauge
  • Needle tip (#1) Installed
  • Conical tip (#2)
  • Reversible Blade 12/35 mm
  • Allen wrench
  • NIST Certificate
  • Instruction manual
  • Wooden box 90 mm x 150 mm x 38.5 mm (L x W x H)


360 degree photo

Available Contact Points
  • 1

    Contact Point (or Standard) – N88-S. This Contact Point was designed for general Corrosion Testing, and remains the most universal in use. The #1 tapers down, over its length, to a blunt point that is less than 0.75 mm (0.030”)  in Diameter.

  • 2

    Contact Point (or Conical) – N88-C. This Contact Point is more robust than the Standard Contact Point, due to its much larger size. The #2 Contact Point is recommended when a large amount of Scanning is being performed. The #2 tapers down, over its length, to a rounded point that is approximately 0.5 mm (0.020”) in Diameter.

  • 3

    Needle Point – N88-N The Needle Point was developed to satisfy the needs of Corrosion Coupon Evaluations, where pits are shallow and small in diameter. The #3 Needle Point tapers down to a very sharp point, so as a result they tend to be very delicate.

contact points

Zeroing dial indicator before use

The vertical position of the Contact Point, needs to be Zeroed with respect to the Knife Edge of the Blade. Zeroing can be accomplished in two ways; by adjusting the Height of the Dial Indicator in the Blade; or by Rotating the outer Bezel Scale while pressing on the Plunger onto a flat surface.

Height Zeroing
Loosen the Fastener(s) holding the Dial Indicator in place. Hold the Blade firmly on a Flat Surface, and gently press the body of the Dial Indicator down until the contact point touches the flat surface. Carefully re-tighten the Clamp Fastener(s) or the Set Screw. Any fine zeroing can be done by rotating the Bezel Scale on the Dial Indicator

Dial Zeroing
To quickly check the Zero Point of the Dial indicator, place the Blade on a representative smooth surface. Gently press the Plunger, until the contact point touches the surface. While the contact point is on the surface, loosen the Bezel Lock, and rotate the Bezel Scale until it reads '0' with respect to the pointer.

Related Products

N88-2-M Basic Pit Depth Gauge

  • Analog metric gauge
  • Resolution 0.01 mm
  • Range 0.0 to 12.7 mm

More details

N88-2-M Basic Pit Depth Gauge

N88-2-D Digital Pit Gauge

  • Digital metric and imperial gauge
  • Resolution 0.01 mm
  • Range 0.0 to 12.7 mm

More details

N88-2-D Digital Pit Gauge

Dimensions Pit Gauges N88-4-M

Measuring range
0.0 to 12.7 mm
0.01 mm
Scale diameter
36 mm
Spring force
Self retracting needle
Weight (net.)
135 g
Weight (including case)
270 g
Length blade
Reversible 12/35 mm width
Dimensions case
90 mm x 150 mm x 38.5 mm (L x W x H)
1 year

Buy Now

Product name
N88-4-M Metric Pocket Pit Gauge (0-14mm @ 0.01mm resolution)
€ 271,00 

Product name
N88-S - Standard #1 Contact Point
€ 14,00 
N88-C - Conical #2 Contact Point
€ 14,00 
N88-N - Needle #3 Contact Point
€ 29,00 
All mentioned prices are excluding VAT & excluding shipment costs.
Availability: Available , preorder 1-2 weeks , special order, request

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