The Meiji Techno  MT9920L Polarizing Microscope is a precision upright brightfield system designed for advanced polarized light analysis using both incident and transmitted illumination. Built on an infinity-corrected, strain-free optical platform, the MT9920L delivers bright, high-contrast images with excellent resolution and color accuracy. Its energy-efficient LED Koehler illumination provides stable, uniform lighting with long operational life, making it an ideal solution for laboratories and educational environments that require consistent performance with minimal maintenance. This system is well suited for the examination of birefringent and anisotropic materials such as minerals, polymers, crystals, and thin sections.

MT9920L features a full set of integrated polarizing components, including strain-free infinity-corrected objectives, a rotatable analyzer, focusable Bertrand lens, compensator plate options, and a ceramic-coated rotating stage with vernier graduations for precise angular measurements. Its ergonomic binocular viewing head, smooth focusing mechanism, and robust mechanical construction support comfortable operation during extended analysis sessions. Manufactured in Japan and backed by Meiji Techno’s limited lifetime warranty, the MT9920L offers reliability, optical precision, and long-term value for applications in geology, mineralogy, materials science, forensics, and industrial inspection.

The MT9900 Series features include:

• Focusable Bertrand lens ( Factory installed)
• Rotatable Analyzer with 180° graduations
• Combination First order red compensating plate and ¼ Wave-length test plate and Brightfield spot with a slider locking pin standard in all models.
• Newly designed Strain free Abbe Condenser 1.25 N.A. with a swing out top lens and built in iris in a dovetail mount is easy to change and operates and tracks very smoothly and predictably facilitating accurate iris control with improved usability
• Polarizer in a Swing in-out click/clamp mount, fully rotatable 360° with click stop at 0°and 90°
• Super Widefield compensating KHW10X, focusing eyepiece with cross-line and guide pin, F.N. 20 are standard with 21mm reticle mount
• Ergonomic Siedentopf type binocular or Trinocular viewing heads are standard
• Smooth operating ball bearing centerable nosepiece provides effortless objective changes
• Clear Observation Images with Newly improved ∞ Infinity Corrected Objectives ICOS Optical System
• Available accessories suited for high-level Polarization Observation
• Intermediate tube with built in analyzer and compensator slot and rotatable polarizer in a swing-out mount
• Ceramic coated, 175mm diameter, ball bearing, circular rotating stage graduated 360°, with 1°increments and vernier reading to 0.1°. Stage equipped with easy to maintain ceramic coating allows for smooth exchange of specimens while offering maximum protection to the stage surface from abrasions and wear overtime of use.  The super hard coating is durable and rugged enough to provide years of demanding use.
• Focus  tension adjustment and safety Auto-focus stage stop lever
• Choice of Bright Lambertian designed LED illumination or 30 watt Koehler Halogen illumination allowing observation of clear images of polarization with automatic voltage sensing power supply 110V-240V.
• Trinocular models compatible with Digital, CCD, CMOS, Analog Meiji Techno adapters for photomicrography
• Cast Aluminum Alloy construction with chemical resistant finish
• Triangular designed frame for maximum ergonomics, greatly lessens user fatigue during hours of extended observation

Brightfield:
The simplest of all the optical microscopy illumination techniques. Sample illumination is incident (i.e. illumination from above and observed from above) or transmitted (i.e., illuminated from below and observed from above) white light and contrast in the sample is caused by absorbance of some of the transmitted light in dense areas of the sample. Brightfield microscopy is the simplest of a range of techniques used for illumination of samples in light microscopes and its simplicity makes it a popular technique. The typical appearance of a brightfield microscopy image is a dark sample on a bright background.

Polarizing Light:
A type of optical microscopy techniques involving polarized light. Simple techniques include illumination of the sample with polarized light. Directly transmitted light can, optionally, be blocked with a polarizer orientated at 90° degrees to the illumination. More complex microscopy techniques which take advantage of polarized light include differential interference contrast microscopy and interference reflection microscopy.

The MT9920 & MT9930 Series Incident and Transmitted Polarizing Microscope is an investigative tool for isotropic and anistropic materials. This series is the most suited in generating interference figures and in mineralogy in the scientific study of crystal structure and physical (including optical) properties of minerals. Specific studies include process of mineral origin and formation, classification of minerals, their geographic distribution as well as their utilization. Ergonomic placement of controls allows for stress free operation, increased lab efficiency and maximum productivity. Incident and Transmitted 6V 30W Koehler Halogen illuminator or LED Koehler illuminator with newly engineered high performance optics strain free ? Infinity Corrected objectives reduce internal strain to an absolute minimum. Our redesigned polarizing condensers with a swing out top lens helps maximize the field of view with lower power objectives to enhance performance in polarized light, yielding unmatched image contrast, provide exceptionally bright, crisp images with good color rendition and superior flat fields of view. Intermediate tube with a built in focusable Bertrand lens and a rotatable Analyzer greatly increases the quality of the image along with a compensator slot and rotatable polarizer with full wave plate.

The MT9920 & MT9930 Series microscopes are used in research, industry and training in many scientific fields such as:

• Environmental Research – Analysis of materials, dust and fiber

• Medicine and Biology – Determining composition of calculi, sediments and bio-crystallates

• Forensics – Identification of trace elements and materials such as explosives

• Materials Analysis – Metal, ceramics, glass, building materials, etc.

• Geology – Mineralogy, petrography, core drilling sample analysis, thin section identification

• Chemistry – Quality control of in-process or end products, compounds, pharmaceutical analysis and identification of precipitates

The MT9920 & MT9930 Incident and Transmitted Light Series is a suitable instrument for most applications in Geology, Petrology, Mineralogy, Toxicology, Chemistry, Pharmaceutics, Medicine, Pulp/Paper, Atmospheric Pollution, Ceramics Technology, Forensic Medicine, etc.

• MT9920L: Binocular MT9900 Series LED Incident and LED Transmitted Polarizing Microscope is an investigative tool for isotropic and anistropic materials. Focusable Bertrand lens, Rotatable Analyzer with 180° graduations. Newly designed Strain free Abbe Condenser 1.25 N.A. with a swing out top lens and built in iris in a dovetail mount is easy to change and operates and tracks very smoothly and predictably facilitating accurate iris control with improved usability.  Newly improved ∞ Infinity Corrected Objectives ICOS Optical System. Ceramic coated, 175mm diameter, ball bearing, circular rotating stage graduated 360°, with 1°increments and vernier reading to 0.1°. Polarizer in a swing in-out click/clamp mount, fully rotatable 360° with click stop at 0°and 90°

Includes:

VIEWING HEADS

Model MA952 is the Siedentopf-type binocular head and Model MA953 is the trinocular head for camera integration. Each head has the 23.2mm eyetubes inclined at 30 degrees with the left eyetube having graduated diopter settings.

The interpupillary distance is adjustable between 53mm – 75mm. An 80/20 beamsplitter for the trinocular tube can be engaged for photo work.

Each head has the new integrated reticle angle compensation system. When the IP distance or number is changed, the crossline reticle remains perpendicular in the FOV.

• MA952: Binocular head – Siedentopf type, inclined at 30 degrees with reticle angle compensation, I.P. adjustment 53mm to 75mm, graduated diopter on left eyetube (23.2.0 mm I.D. eyetube) (Included in model MT9920 & MT9920L)

EYEPIECES

10X Widefield High Eyepoint eyepieces F.N.20 are standard. A Widefield High Eyepoint 10X focusable eyepiece that has a 21mm crossline reticule and guide pin is also available.

• MA407CP: Super Widefield compensating KHW10X, focusing eyepiece with cross-line and guide pin, F.N. 20 are standard with 21mm reticle mount
• MA407: KHW-10X Compensating eyepiece, F.N. 20 (each) (Tube O.D. 23.2mm) (qty#1)

OBJECTIVES

Meiji Techno offers an assortment of S.Planachromat Infinity Corrected objectives for Transmitted Light or Incident Light .
The smooth-operating, ball bearing mounted, quadruple nosepiece provides effortless objective changes.

• MA935: Strain free Plan objective 4X/N.A.0.10, W.D. 25.89mm, ∞ Infinity Corrected
• MA936: Strain free Plan objective 10X/N.A.0.25, W.D. 7.3mm, ∞ Infinity Corrected
• MA938: Strain free Plan objective 40XS/N.A.0.65, W.D. 0.50mm, ∞ Infinity Corrected

CONDENSER

All new Strain Free Abbe N.A. 1.25 condenser with iris in dovetail mount.

• MA976/05: Strain free Abbe condenser with swing out top lens, N.A. 0.90 with iris diaphragm and dovetail mount

STAGE

Ceramic coated 360 degree rotatable fully indexed stage with vernier and stage clips.

• MA946: Stainless steel Stage Clips (qty#2)

• Stage: Rotatable stage with Vernier graduation 360° with Vernier, reading to 1°, 150mm diameter with stainless steel stage clips (Factory Installed)

ILLUMINATION

Powerful 30 watt Koehler halogen illumination in either transmitted and/or vertical incident, provides enhanced image quality and brightness for the observation of specimens.

• MA955LED: Vertical Koehler illuminator attachment, LED (Included in MT9920L & MT9930L)
• MA927/05LED: Table-top transformer with automatic voltage sensing power supply for use with  MA955LED
• MA927/05: Table-top transformer with automatic voltage sensing power supply for use with MA955 vertical illuminator (Input voltage 100V-240V) (Included with MT9920 and MT9930 Series)
• MA289/05: Blue clear filter, 29.8mm diameter unmounted, for transmitted light (Included in Halogen models)
• MA679: Polarizing filter in metal mount (For use with incident illuminator, fits 25mm filter slot)

• MA809/10: Removable AC Electric cord with plug for 115V models (*Included in all 115V models) or
• MA809/20: Removable AC Electric cord with plug for 220V models (*Included in all 220V models)

POLARIZING ACESSORIES

• Polarizer: Swing in-out click/clamp mount, fully rotatable 360° with click stop at 0°and 90° (Included in MT9920 and MT9930 series) (Factory Installed)

All MT9000 Series come standard with 1/4 wave plate, Bertrand lens and first order red plate. Optional Senarmont compensator and quartz wedges are available along with attachable point counting stage.

• MA988: CombinationFirst order red compensating plate and 1/4 Wave-length test plate and Brightfield spot, for use with MT9920 and MT9930 (20mm X 6mm X 142mm)
• MA956/05: Rotatable analyzer with 180 degree graduations (34mm x 6mm x 156mm)

• MA494/PT#1: Nosepieces centering screws (each) (qty# 2)
• MA701/05: Dust cover for MT9900 Series (Included in all models)
• MA905: Interference Color Chart Laminated Sheet
• Warranty: Limited Lifetime Warranty Card

PHOTOMICROGRAPHY

Meiji Techno offers a broad range of digital video cameras which offers excellent sensitivity, high resolution and a wide dynamic range for the most demanding brightfield and darkfield microscopy applications including clinical pathology and cytology, life sciences and geology. Some models has included software, that can preview and capture still shots and live videos to a PC or Mac with USB port or HDMI connectivity.

MT9920L POLARIZING SERIES BROCHURE

(CLICK TO DOWNLOAD FULL BROCHURE)

Product Information:
• Manufactured: 100% MADE IN JAPAN
• Warranty: LIMITED LIFETIME WARRANTY
• Customer Support: 1-(800) 832-0060 (U.S.A Based)

Package Information:
• Weight: 33lbs (9.06kg)
• Box Size: 28 x 16 x 13 inches
• Footprint: 263mm (D) x 176mm (W)
• Binocular head type: 297 mm(D) x 504mm (H) x 212mm(W) (11.4kg)( 41.33 lbs.)
• Trinocular head type: 297 mm(D) x 558mm(H) x 212mm(W) (12.2Kg)(44.0 lbs.)