3700 Series
14" Horizontal Beam Optical Comparator

3700 Series


This is our top-of-the-line 14" benchtop horizontal beam optical comparator. The 3700 is the ultimate system for load capacity and accuracy. It features an erect image and S-T's exclusive Gothic arch bearing ways which provide the best in accuracy and longevity.


  • Erect image.
  • High precision 6" x 12" measuring stage travel with .00005"/.001 mm resolution precision glass scales. Quick release with fine adjust on X-axis. Optional 5" x 16" travel. 100-lb load capacity.
  • Choice of QuadraChek® or Metlogix digital readouts.
  • Standard 2-lens turret system.
  • Hardened steel, nickel-plated workstage for long life and corrosion resistance.
  • Helix +/- 6° via lamphouse displacement.
  • Heavy-duty all-steel construction.
  • Fully useable 14" diameter screen.
  • Standard swingaway lamphouse.
  • Duplex fiber optic surface illumination.
  • Digital screen protractor with readings to 1' or .01°.
  • Available motorized joystick control and CNC option.

Optional Magnification Lenses

  • 5x Magnification
  • 10x Magnification
  • 10x Magnification with long focal distance
  • 20x Magnification
  • 20x Magnification with long focal distance
  • 25x Magnification
  • 31 1/4 x Magnification
  • 50x Magnification
  • 62 1/2 x Magnification
  • 100x Magnification



  • 3700-series-specs-smallWork Table: 5" x 20" (125 mm x 500 mm) w/2 clamping slots
  • Measuring Travel: 12" (300 mm) (X), 6" (150 mm) (Y), 2.5" (60 mm) Focus Optional 16" Horiz. Travel
  • Measuring Stage Resolution: .00005"/.001 mm
  • Allowable Work Load: 100 lb (45 kg)
  • Two-Lens Turret
  • Digital Screen Protractor: 1 min/.01° arc
  • Duplex Surface Illumination
  • Helix: +/- 6° via lamphouse displacement
  • 14" Frosted Glass Screen: with 30-, 60- and 90-degree crosslines
  • Electrical: 115/220 V, 50/60 Hz
  • Weight: Net 325 lb (145 kg) - Crated 465 lb (206 kg)

Quote Request

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Comparator and Readout Systems

Catalog #Description
20-3700-01 3700 WITH QC 121 DRO
20-3700-02 3700 WITH QC 221 DRO
20-3700-03 3700 WITH QC 221E DRO with Edge Sensing
20-3700-05 3700 WITH QC 5215 DRO with Edge Sensing
20-3700-22 3700 with M2 DRO
20-3700-23 3700 with M2E DRO with Edge Sensing

Motorized Stage Option

This Option Provides Motorized Movement of X and Y Axis. Included is a 2-Axis Joystick, Fine Position Jog Knobs, Stepper Motors and 2-Axis Driver. This Option is Available with Any of the DRO Options Above. This May Be Upgraded in the Future to CNC Control with a QC 5215 DRO.

Catalog #Description
20-3730-00 2-Axis Motor Drive Option, 12" X-Axis Travel

CNC Comparator Systems

CNC Motor Control Options include Joystick Control of Stage Motion and Fine Position Jog Knobs for Exact Positioning. Also includes Optical Edge Detection and CNC Motor Drive System for Automatic Measurement. M2E DRO provides easy to use, programming control and fixed reporting capability. Includes all feature types (point, line, circle, arc, distance, angle and skew), tolerancing and single feature graphic display. QC5215 DRO is a PC based readout system with CAD-Like User Interface and Unlimited Feature and Part Program Storage. Features complete graphical part display, as well as comprehensive reporting capability.

Catalog #Description
20-3788-23 CNC 3788 with M2E DRO with Stepper Motors
20-3788-01 CNC 3788 with QC5215 DRO with Stepper Motors

Magnification Lenses

Catalog #Description
20-0320-01 5X Magnification Lens
20-0310-00 10X Magnification Lens
20-0310-05 Long Focal Length 10X Lens
20-0313-00 20X Magnification Lens
20-0312-00 Long Focal Length 20X Lens
20-0315-00 25X Magnification Lens
20-0317-00 31 1/4 Long Focal Length Lens
20-0318-00 50X Magnification Lens
20-0319-01 62 1/2X Magnification Lens
20-0321-01 100X Magnification Lens

Staging Fixtures

Catalog #Description
20-0390-00 Right Angle Backing Plate
20-2540-00 Vertical Glass Fixture
20-3623-00 Concentricity Fixture, 1.0" Capacity
20-3624-00 Concentricity Fixture, 2.0" Capacity
20-3630-00 Rotary V-Block
20-3631-00 Rotary Vise Fixture
20-3632-00 Stage Centers
20-3633-00 V-Block with Centers

Options and Accessories

Catalog #Description
20-1679-00 Replacement Heavy Duty Dust Cover
20-0311-00 Green Filter
20-1406-02 Heavy-Duty Console Base
20-1411-00 Standard Console Base
*20-1412-00 Optional Lockable Side Drawer for 20-1411-00
20-3512-00 Telecentric Stop        
20-3513-00 Telecentric Stop with Built-In Green Filter
20-1628-00 Curtain & Canopy
48-7271-00 Replacement Lamp, Profile Illumination
48-7747-00 Replacement Lamp, Surface Illumination
74-0321-10 10" Glass Magnification Scale, Certified
74-0413-00 Ball Checker, Certified
74-0008-1525 Replacement Glass Screen
74-0500-00 Stage Calibration Master, Certified