Profile Projetor - Optical Comparator - QV-300
Profile Projector - QV-300S
Profile Projector / Optical Comparator Diagram


Profile projector is widely used for complex shape stampings, gears, cams, threads and comparing the measured contour model. It’s easy to use and highly efficient. It is a commonly used measurement of optical instruments.

Thus, profile projector is widely used in major machinery manufacturing including aviation, aerospace industry, watches and clocks, electronics, instrumentation industry, research institutes and detection metering stations at all levels and etc.

The projector magnifies the profile of the specimen, and displays this on the built-in projection screen. On this screen there is typically a grid that can be rotated 360°so the X-Y axis of the screen can be aligned with a straight edge of the machined part to examine or measure.

Profile Projetor - Optical Comparator - QV-300

Qualitest offers best selling and top quality profile projectors that are highly versatile and easy to operate. This popular series has large travel range, excellent quality and performance and is very reasonable priced.

300mm screen vertical light path projector with multi-function readout unit and printer. Robust design with full geometric measuring functionality ideal for the shop floor.

  • Top quality profile projector highly versatile and easy to operate
  • Large travel range 150mm x 50mm (6"x 2") as standard
  • Linear scale stage with 0.001mm resolution
  • Fine ground glass screen for clear image with cross hairs
  • Screen complete with cross hair lines and chart clips
  • Built-in profile and surface illumination 10x, 20x, 50x, 100x projection lenses available
  • Data output via RS-232 interface
  • Display-readout unit DC300 included in standard delivery


  • Projection capacity (unit mm) Magnification 10x 20x 50x 100x
  • View field diameter 30 15 6 3
  • Working distance W 77.7 44.3 24.5 25.3
  • Max. workpiece height H 80 80 80 80
  • Max. workpiece diameter, 160 130 55 60 edge line can be focused on the screen center D
Technical Specifications for Profile Projector / Optical Comparator QV-300
Stage XY travel range150mm x 50mm (X x Y)
Stage Z-axis travel range90mm
Stage effective glass size196mm x 96mm
Stage dimensions340mm x 152mm
Stage measuring deviceBuilt-in linear scales
Stage resolution0.001mm
Screen rotary range312mm diameter, effective diameter 300mm
Digital angle display0-360°
Angle resolution0.01° or 1'
FunctionsZero set, ABS/INC selection, mm/inch selection, 1/2 calculation
Projection lens10x, 20x, 50x, 100x (selection see options)
Magnification accuracy
Contour±0.1% or less
Surface±0.15% or less
Contour illumination
Light source24V, 150W halogen lamp
MethodZooming telecentric illumination
Function2-step brightness selection
Surface illumination
Light source24V, 150W halogen lamp
MethodVertical surface using half-transparent mirror
Filters lightGreen, blue
Data outputRS-232 from counter
Power supply220/110V AC / 50-60Hz
Dimensions780mm x 550mm x 1140mm

Standard Delivery

  • Projector unit
  • DC300 digital readout unit shield
  • Power cable
  • Chart clips (4 pcs)
  • Spare fuses 5A/3A
  • Spare lamps 24V/150W
  • Manual
  • Certificate

Optional Accessories

  • Projection lens 10x with half reflecting mirror
  • Projection lens 20x with half reflecting mirror
  • Projection lens 50x with half reflecting mirror
  • Projection lens 100x with half reflecting mirror
  • Rotary table 360°
  • Swivel centre suppor
  • Holder with clamp V-block with clamp
  • Overlay charts
  • Software for QV-300

Profile Projector - QV-300S

Profile Projector QV-300S can effectively test various work pieces with complex shapes, such as templates, punching pieces, cams, gears, threads by profile comparative and coordinate measuring ways. It is widely used in different measuring departments and inspection stations of various industries e.g. machinery, watch-making, electron, instrument & meter, science and research institutes etc. including space science and aviation industry.


  • Two kinds of illuminations (high and low levels) can meet the measuring requirements of various work-pieces
  • Non-spherical surface illumination system is processed by special techniques, which makes view field be symmetrical & clear, and guarantee a higher accuracy
  • Axial flow fans heat is used for a strong dissipation efficiency, this is incomparable in analogy products
  • Small bulk, low weight, easy to move about
  • It is equipped with long-life illuminating bulb, suitable for long time use
  • It is equipped with various accessories for customer’s option, which makes measurement more convenient and rapid
  • It is equipped with multi-functional counter and mini-printer
  • Surface illumination system can be adjusted conveniently, which is stable, reliable and suitable for operation
  • Worktable base adopts front door design, which makes maintenance more convenient

Technical Specifications

  • Screen diameter: ø300mm
  • Rotating range: 0o - 360o
  • Rotating angle resolution: 1’
  • Rotating angle accuracy: 6’
  • Worktable size: 340mm x 152mm
  • X axis travel: 150mm
  • Y axis travel: 50mm
  • Z axis travel: 80mm (focusing)
  • Accuracy of X,Y axis: (4+L/25) µ m
  • Resolution: 0.001mm
  • Image: Erect
  • Load capacity: 5 kg
  • Overall size: 380x694x1068mm
  • Transmission lighting: 12V, 100W Halogen tungsten lamp
  • Reflecting lighting: 24V, 150W Halogen tungsten lamp
  • Rated voltage: 110V, 60Hz / 220V,50Hz
  • Mainframe weight: 135kg



View filed on object (mm)

Working distance (mm)














Standard Accessories

  • 10 x objective
  • 10 x semi-transmitted and semi-reflecting mirror

Optional Accessories

  • 20 x objective (with 20 x semi-transmission and semi-reflecting mirror)
  • 50 x objective (with 50 x semi-transmission and semi-reflecting mirror)
  • 100 x objective (with 50 x semi-transmission and semi-reflecting mirror)
  • Automatic edge-finder
  • Thimble cradle
  • V-shaped support
  • Rotary worktable
  • Magnifier
  • Presser (4 pieces)

Multi-functional Data Processors

  • Determine straight line and circle by multiple dots collecting
  • Pre-set different geometrical elements
  • Coordinates can rotate and move horizontally
  • Polar coordinates and rectangular coordinates can converse mutually
  • Determine different geometrical elements by combination way
  • Printing and output function measuring results
  • RS232 output function
  • Z coordinates can be set as length value of sensor and angle value of encoder
  • Measuring error correction function

For more information about Profile Projectors - Optical Comparators, please call us at 1.877.884.8378 or Click the button below.