Optical Comparators and Accessories

Optical comparators have been used for over 50 years and are considered a versatile technology for monitoring the quality and tolerances of a broad range of manufactured parts. These inspection machines project magnified images of parts against a glass screen using light, lenses, and mirrors. This enables technicians to make 2-dimensional measurements.

For over 70 years, ST Industries has produced measuring products for manufacturing applications. Their reputation rests not only on the quality of their products, but also upon their manufacturing processes. Every SCHERR-TUMICO optical component is not mass produced, but individually hand-crafted, then quality-control tested through each step of the process. The company guarantees that every instrument produced is reliable and proven. Despite this attention to detail, every component is competitively-priced. ST Industries’ high-quality Optical comparators and accessories are available through Thread Check Inc. A large selection of automatic and video inspection equipment is available in our online catalog.

Cost Effective and Precise Optical Comparators

ST Industries’ SCHERR-TUMICO optical comparators are designed to provide the best value for your investment. SCHERR-TUMICO optical comparators are offered in a wide range from small economical machines to large CNC measuring systems. S-T Industries has incorporated many innovative features into its products. Exclusive Gothic arch ballways provide the ultimate in accuracy, strength, and durability.

SCHERR-TUMICO’s 30-inch comparators are fitted with large castors so that they can be easily moved by a single person. All CNC products have digital positioning systems that allow table movements of one micron. In addition, every optical comparator has been proudly made in the USA in ST Industries’ Minnesota plant.

For more information or to order, please contact our staff by filling out our form, or calling us directly at (800) 767-7633 (USA and Canada) or (631) 231-1515.

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  1. 10x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    10x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 10x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  2. 20x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    20x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 20x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  3. 30x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    30x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 30x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  4. 25x Magnifying Lens for S-T Industries Optical Comparator 3500 Series
    25x Magnifying Lens for S-T Industries Optical Comparator 3500 Series
    This 25x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 Series. More Info
  5. 31-1/4x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    31-1/4x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 31‐1/4x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  6. 50x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    50x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 50x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  7. 62 1/2x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    62 1/2x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    62 1/2x Magnifying Lens for S‐T Industries Optical Comparator 3500 / 3700 Series More Info
  8. 5x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    5x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 5x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  9. 100x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    100x Magnifying Lens for S-T Industries Optical Comparator 3500 / 3700 Series
    This 100x magnifying lens is for use with your S‐T Industries Optical Comparator 3500 / 3700 Series. More Info
  10. Heavy-Duty Console Base for S-T Industries Optical Comparator 3500 Series
    Heavy-Duty Console Base for S-T Industries Optical Comparator 3500 Series
    This heavy duty console base is for use with your S‐T Industries Optical Comparator 3500 Series. All‐steel console features a front door with four adjustable leveling pads. More Info
  11. Heavy Duty Console Base for S-T Industries Optical Comparator 3700 Series
    Heavy Duty Console Base for S-T Industries Optical Comparator 3700 Series
    This heavy duty base is for use with your S‐T Industries Optical Comparator 3700 Series. More Info
  12. Vertical Glass Fixture for S-T Industries Optical Comparator 3500 Series
    Vertical Glass Fixture for S-T Industries Optical Comparator 3500 Series
    This vertical glass fixture is for use with your S‐T Industries Optical Comparator 3500 Series. Features pexiglass holding area with spring clips. It holds parts up to 41/2" x 81/4" in diameter. This fixture is ideal for thin, flat or flexible... More Info
  13. Optical Comparator 3500 Series - S-T Industries with Quadra-Chek 121 DRO - 14 in.
    Optical Comparator 3500 Series - S-T Industries with Quadra-Chek 121 DRO - 14 in.
    Optical Comparator 3500 Series ‐ Features The "3500" Series 14" benchtop horizontal beam is the perfect general purpose optical comparator. Its high accuracy and compact size make it the choice of even the most demanding user. The unique,... More Info
  14. Optical Comparator 3500 Series - S-T Industries with Quadra-Chek 220 - 14 in.
    Optical Comparator 3500 Series - S-T Industries with Quadra-Chek 220 - 14 in.
    Optical Comparator 3500 Series ‐ Features The "3500" Series 14" benchtop horizontal beam is the perfect general purpose optical comparator. Its high accuracy and compact size make it the choice of even the most demanding user. The unique,... More Info
  15. Rotary V-Block for S-T Industries Optical Comparator 3500 Series
    Rotary V-Block for S-T Industries Optical Comparator 3500 Series
    This rotary v‐block is for use with S‐T Industries Optical Comparator 3500 Series. It rotates 360˚ with readings to 1˚. This V‐Block holds parts up to 11/8" in diameter, including clamp. More Info
  16. Rotary Vise Fixture for S-T Industries Optical Comparator 3500 Series
    Rotary Vise Fixture for S-T Industries Optical Comparator 3500 Series
    This rotary vise fixture is for use with your S‐T Industries Optical Comparator 3500 Series. It rotates 360˚ with readings to 1˚ and opens to 11/2" x 1.0" deep. More Info
  17. Stage Centers for S-T Industries Optical Comparator 3500 Series
    Stage Centers for S-T Industries Optical Comparator 3500 Series
    These stage centers are for use with your S‐T Industries Optical Comparator 3500 Series. V‐Blocks will hold parts up to 1.0" in diameter and the centers will hold parts up to 37/16" in diameter. More Info
  18. Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 121 DRO - 14 in.
    Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 121 DRO - 14 in.
    Optical Comparator 3700 Series ‐ Features 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... More Info
  19. Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 221 DRO - 14 in.
    Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 221 DRO - 14 in.
    Optical Comparator 3700 Series ‐ Features 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... More Info
  20. Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 221E DRO - 14 in.
    Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 221E DRO - 14 in.
    Optical Comparator 3700 Series ‐ Features 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... More Info
  21. Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 321E DRO - 14 in.
    Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 321E DRO - 14 in.
    Optical Comparator 3700 Series ‐ Features 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... More Info
  22. Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 5215 DRO - 14 in.
    Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 5215 DRO - 14 in.
    Optical Comparator 3700 Series ‐ Features 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... More Info
  23. 2 Axis - Stepper Motor Drive for S-T Industries Optical Comparator 3700 Series
    2 Axis - Stepper Motor Drive for S-T Industries Optical Comparator 3700 Series
    This 2 axis ‐ stepper motor drive is for use with your S‐T Industries Optical Comparator 3700 Series. More Info
  24. CNC Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 321E DRO
    CNC Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 321E DRO
    Optical Comparator 3700 Series ‐ Features 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... More Info
  25. CNC Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 5215 DRO
    CNC Optical Comparator 3700 Series - S-T Industries with Quadra-Chek 5215 DRO
    Optical Comparator 3700 Series ‐ Features 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... More Info
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