8400K Digital Optical Depth Measurement Micrometer

8400K Digital Optical Depth Measurement Micrometer

Fast, Reliable and Repeatable. Take the guesswork out of visual inspection.

Fast, Reliable & Repeatable

The 8400K Optical Depth Measuring Micrometer is a portable inspection microscope with depth measurement capability. It quickly and accurately measures the depth of scratches, fractures, cracks, crazing, corrosion pits, scribe lines, and other surface damage. It is easy to operate and requires no special training or expertise to use. The 8400K is durable, portable and can be easily calibrated in-house. The 8400K can be used on flat or curved surfaces, metals, plastics, composites, painted or chemically treated finishes, as well as transparencies and is capable of magnifications from 40X to 200X with depth measurements at an accuracy of +/- 0.001”.


Rugged & Portable
The 8400K was designed for use in the field. The sealed non-magnetic case is dustproof and shock resistant to withstand everyday shop use. The hardwood instrument case also contains adapters and lenses for use on convex, concave or any combination of these surfaces.

Real Cost Savings
With the 8400K, damage can be measured optically in a fraction of the time needed for other methods such as "blend-out." Spending time on a part that may need replacement is costly. In many cases the 8400K can be used to inspect installed parts on aircraft, piping, etc.

Serial Port for PC Access
In addition to the clear LCD readout "floating zero" and other features, the 8400K's digital display also has an RS232 serial port for data export to the optional processor/printer.

How the Optical Micrometer works

First, focus on a smooth surface next to a scratch. Then, zero out the digital display (you can choose a readout in either inches or millimeters). Next, focus on the bottom of the scratch. The digital display shows depth relative to the surface.

4400M Surface Replication Kit 

The 4400M Surface Replication Kit features the high resolution Microset replication compounds. Microset compounds are specially formulated two-part polymers, designed for high resolution replication of surface details. They are supplied in convenient and reliable cartridge application systems which allow replicas to be made, in any shape or size, of most solid non-porous surfaces. When used in conjunction with the 8400K Optical Micrometer Kit, Microset compounds provide a quick and convenient method of obtaining precise measurements of damage in hard to reach places. 

Common Applications:

  • Threaded Holes
  • Inside Diameters
  • Spline Inspection
  • Re-Entrant Geometries
  • Delicate Surface Finishes

Click on Link for more information on Microset Replication products - Microset 

Technical Specifications

8400K Digital Optical Micrometer Kit Specifications

Accuracy +/- 0.001" (+/- 0.02mm)
Resolution 0.0005" (0.01mm)
Magnification 80X - 200X
Vertical Range 10X Objective - Max depth 0.250" (6.4mm)
4X Objective - Max depth 1.250" (32mm)
Operating Temperature 32°F to 140°F (0°C to 60°C)
Storage Temperature 14°F to 140°F (-10°C to 60°C)
Kit Dimensions 13" x 11" x 6" (330 x 279 x 152mm)
Kit Weight 6.5 lbs. (2.95 kg)
Calibration Recommended calibration cycle: 12 months

Kit Includes

8400K Digital Optical Micrometer Kit Includes

  • Digital Optical Micrometer
  • 3 Interchangeable Bases
  • 2 Eyepieces - 10X, 20X
  • 2 Objective Lenses - 4X, 10X
  • Scratch Sample Plate
  • LED Flashlight
  • Case w/ Foam Insert
  • 2 Year Warranty
  • Manufacturer's Certificate of Conformance
  • Certificate of Accuracy
4400M Microset Replication Kit Includes

  • One 50ml Dispensing Gun
  • Five 50ml Replication Compounds (choice of grade)
  • 50ml Nozzle Pack (Pack of 50)
  • Backing Slides (Pack of 50)
  • Backing Paper (Pack of 100)
  • Tilting Stage Base
  • Tall Tripod Optical Micrometer Base
  • ABS Carrying Case

3 Interchangeable Bases

Use the 3 Leg Base on Flat Surfaces

Use the 4 Leg Base on Curved Surfaces

Use the Clear V Block Base for Small Diameters, Outside Angles and
Edges of Flat Surfaces

Optional Accessories

Stand & X-Y Stage

Ideal for inspecting small parts



AM7025X Dino-Eye 5MP USB Microscope Eyepiece Camera

Records images to your PC or Tablet 

Description Part # Saved Price Select Option Add to

8400K Optical Micrometer Kit & Accessories

8400K Optical Micrometer Kit Includes: Unit, 3 Interchangeable Bases, 3 or 4 leg & acrylic, 2 Eyepieces-10X, 20X, 2 Objective Lenses-4X, 10X, Scratch Sample Plate, LED Flashlight & Case GA-JCK-8400K $3,995.00
AM7025X Dino-Eye Edge 5MP USB Eyepiece Camera GA-JCK-DINO-EYE $649.00
8400-71, Base, 3-Leg Soft Tip GA-JCK-8400-71 $79.00
8400-12, Base, 3-Leg Offset GA-JCK-8400-12 $95.00
8400-27, Tall Tripod Base, 4.5" GA-JCK-8400-27 $196.00
8400-35, Base, Corner GA-JCK-8400-35 $95.00
4400-4, Backing Slides, 60mmx40mm, 50/Pack GA-JCK-4400-4 $62.00
4400-5, Backing Paper, 70mmx60xxm 100/Pack GA-JCK-4400-5 $23.00
4400-6, Carrying Case, 4400M Surface Rep Kit GA-JCK-4400-6 $185.00
4400-7, Tilting Stage Base GA-JCK-4400-7 $208.00
Lab Stand Kit, with X-Y Stage Included GA-JCK-5500L $2,250.00
Lab Stand Kit, with no X-Y Stage GA-JCK-5500K $1,250.00
X-Y Stage, for 5500 Lab Stand GA-JCK-5500-50 $1,430.00
Instrument Calibration (ISO17025) w/ Cert & Test Data GA-JCK-8400-0-Cal $95.00

Microset Replication Materials

4400M, Surface Replication Kit GA-JCK-4400M $1,045.00
4400-1, Microset Dispensing Gun, 50ml GA-JCK-4400-1 $95.00
4400-2RTG, Microset Replication Compound (Thixotropic), 50ml, Grey GA-JCK-4400-2RTG $56.00
4400-2RFG, Microset Replication Compound (Fluid), 50ml, Grey GA-JCK-4400-2RFG $56.00
4400-3, Microset Nozzle Pack, 50ml, 10/Pack GA-JCK-4400-3 $22.00
4400-31, Microset Nozzle Pack, 50ml, 50/Pack GA-JCK-4400-31 $102.00