Advanced optical performance with excellent cost-efficiency.

Incorporating new UIS2 infinity optics, the Olympus CX31 microscope inherits the outstanding worldwide reputation gained by its CX2 predecessor in different medical and educational
fields. As well as advanced optical performance, the CX31 offers improved ease of use and excellent cost-efficiency.

Binocular observation tube

Diopter adjustment is performed via the knurled collar on the left eyetube. Wide interpupillary distance adjustment
(48-75 mm) ensures the best and most comfortable observation conditions for every user.

Quadruple inward-facing revolving

Complies with a wide range of magnifications, allows unrestricted use of the space in front of the objectives and makes it easy to confirm observation magnifications.

Coarse upper limit stopper

Locks the upper position of the stage, preventing contact between the objective and the specimen in high magnification observations.

Rackless Stage!

Rack-free stage with no side protrusions. Low-positioned control knob allows smooth and comfortable specimen movement. Scale gradations are in white lettering on a black background.

Abbe condenser

An Abbe condenser, with N.A. 1.25 and built-in aperture diaphragm, provides the appropriate diaphragm setting to suit different specimens and magnifications.

Coaxial coarse/fine focusing knob

The coaxial coarse/fine focusing knob allows each operator to adjust the torque for coarse focusing operations. Focusing is smooth and easy, with the user's hands placed on the desk.

Hand grips for easy portability

Convenient hand grips at the front and back of the frame make it easy to carry the microscope.

Stage handle with tactile grips

Tactile grips are fitted to the X and Y stage controls to provide a "light touch" stage movement.

UIS2 eyepiece

Provides wide field of view (F.N. 20) and allows easy observation with eyeglasses.

UIS2 objectives

4X, 10X, 40X and 100X PLCN objectives, providing world-class image flatness.

Light intensity adjustment

Continuous light adjustment is possible.

Field stop

Frame integrated, with ability to accept a ø45 mm filter.

Outstanding flat images from PLCN objectives

The PLCN series of UIS2 objectives improves flatness dramatically, producing sharp, clear images right up to the edge of the field of view. Ideal for the 10x and 40x objectives so frequently used for inspection work, the flatness ranks among the very best in this class of microscopes.

Bright, even observation images

The illumination system employs a high intensity 6 V, 30 W halogen lamp for bright images. The aperture iris diaphragm with built-in condenser and standard field stop provides bright and even illumination at all levels of magnification.

Rigid, durable construction for high performance and long service life

Construction quality is excellent throughout, with objectives, eyepiece, observation tube, revolving nosepiece, highly reliable rackless stage and other components all fixed firmly to the body — so there's nothing to come loose or fall off when the microscope is being transported. The highly regarded rackless stage is employed, and since the X-axis guide does not protrude, both transportation and operation are performed easily and safely.

Anti-fungus treatment

The treatment applied to the observation tubes, eyepieces and objectives, protects quality of optical parts even in high humidity regions.

Items CX31
Optical Systems UIS2 {Universal Infinity-corrected) Optical System
Illumination Built-in transmitted Koehler illuminatior
6 V 30 W halogen bulb
100-200 V/220-240 V 0.85/0.45 A 50/60 Hz
Focusing ♦ Stage height movement by roller guide (rack & pinion) ♦ Stoke per rotation: 36.8 mm
♦ Full stoke range: 25 mm ♦ upper limit stopper ♦ Tension adjustment on coarse focus adjustment knob
Revolving nosepeice Fixed quintuple nosepiece with inward tilt
Observation Tube
Feild Number
Tube Inclination
Interpupillary distance adjustment range
Light path sector
U-CBI30, Binocular U-CTR30-2, Trinocular U-CTBI, Tilting binocular
20 20 18
30° 30° 30°-60°
48-75 mm 48-75 mm 48-75 mm
None None (Bi 50%, Video/Photo 50% fixed) None
Movement range
Specimen holder
Rubber grip
188 (W) * 134 (D) mm
76 mm X-direction * 50 mm Y-direction
Double slide holder
Equipped as standard
Aperture iris diapragm
Abbe condenser, with-built-in daylight filter
1.25 with oil immersion
Dimensions & weight 233 (W) * 432 (H) * 367.5 (D) mm, approximately 18.7 lb.