MAGUS Bio 250B biological microscope is an optical instrument used for studying thin transparent and translucent objects. Brightfield microscopy in transmitted light is the main microscopy technique. The microscope can be equipped with additional accessories for using darkfield phase contrast and polarization techniques. High-quality optics with additional options to expand its capabilities easy-to-use mechanics and smart design make this microscope an excellent choice for lab work research and teaching.


The binocular head allows you to mount a digital camera in one of the eyepiece tubes (camera not included). The tubes can be rotated 360° to obtain a comfortable position to fit the height of the observer. The diopter adjustment ring is located on the left tube.

The revolving nosepiece allows for mounting 5 objectives. The microscope comes with infinity plan achromatic objectives that provide clear high-contrast images across the entire field of view. There is a single free slot in the revolving nosepiece for mounting an additional objective. The revolving nosepiece with objectives is oriented toward the interior so that the user can see the objectives inserted into the optical path and the space above the stage is free.

The microscope optics in the basic configuration provides magnification from 40 to 1000x. The use of additional eyepieces if necessary allows you to increase the upper limit of the magnification range.


Light source: 30W halogen bulb. It provides uniform and bright illumination of the sample using any objective lens and any observation method including darkfield and phase contrast techniques. The warm spectrum of light is pleasing and comfortable for the eyes so they will not get tired even when working with the microscope for long periods of time.

The Abbe condenser has a slot for mounting a darkfield or phase slider. The condenser design simplifies and speeds up the process of switching research techniques. The condenser is height-adjustable and can be centered. The field diaphragm makes it possible to set up the Köhler illumination.

Stage and focusing mechanism

The stage is equipped with a mechanical attachment that can be removed for manual scanning. There is no positioning rack that ensures the ergonomic operation of the stage.

Focus adjustment is adjusted by the coaxial coarse and fine focusing knobs on both sides of the microscope body. The mechanism is smooth and precise and no effort is required to rotate the knobs. The coarse focusing has a lock knob and tension adjustment. The focusing knobs are located at the bottom. Therefore you can rest your hands on the table rather than holding your arms in the air. It increases comfort during long work sessions.


A wide range of accessories allows the MAGUS Bio 250B to be configured in the most convenient way for the user. Eyepieces lenses darkfield phase contrast and polarization devices calibration slides and digital cameras are available.

Key features:

  • Infinity plan achromatic objectives
  • Binocular head with an option of mounting a digital camera in one of the eyepiece tubes diopter adjustment on the left tube
  • The height of the binocular head can be adjusted by rotating the eyepiece tubes 360°
  • Coaxial coarse & fine focusing knobs coarse focusing tension adjusting knob coarse focusing lock knob
  • Field diaphragm for setting up the Köhler illumination
  • Slot in condenser for installing a slider: darkfield or phase slider
  • 30W halogen lamp for working in transmitted light
  • Option to install additional accessories

The kit includes:

  • Base with a power input transmitted light source focusing mechanism stage condenser and revolving nosepiece
  • Binocular head
  • Infinity plan achromatic objective: 4x/0.1
  • Infinity plan achromatic objective: 10x/0.25
  • Infinity plan achromatic objective: 40x/0.65 (spring-loaded)
  • Infinity plan achromatic objective: 100x/1.25 (spring-loaded)
  • Eyepiece 10x/22mm with a long eye relief (2 pcs.)
  • Eyecups (2 pcs.)
  • Filters (4 pcs.)
  • Bottle of the immersion oil
  • Hex key wrench
  • AC power cord
  • Dust cover
  • User manual and warranty card

Available on request:

  • 10x/22mm eyepiece with scale
  • 12.5x/14mm eyepiece (2 pcs.)
  • 15x/15mm eyepiece (2 pcs.)
  • 20x/12mm eyepiece (2 pcs.)
  • 25x/9mm eyepiece (2 pcs.)
  • Infinity plan achromatic objective: 20x/0.4
  • Infinity plan achromatic objective: 60x/0.80 (spring-loaded)
  • Phase contrast device
  • Phase slider
  • Darkfield condenser NA 0.9
  • Oil darkfield condenser NA 1.36–1.25
  • Darkfield slider
  • Polarization device
  • Digital camera
  • Calibration slide
Warranty years 5
EAN 5905555018003
Package size (LxWxH) cm 43.1x27.1x63
Shipping Weight kg 10
Type biological light/optical
Head binocular
Revolving nosepiece for 5 objectives
Interpupillary distance mm 48 — 75
Stage mm 180x150
Stage moving range mm 75/50
Eyepiece diopter adjustment diopters ±5 (on the left tube)
Condenser Abbe condenser N.A. 1.25 center-adjustable height-adjustable adjustable aperture diaphragm a slot for a darkfield slider and phase contrast slider dovetail mount
Diaphragm adjustable aperture diaphragm adjustable iris field diaphragm
Focus coaxial coarse focusing (21mm 39.8mm/circle with a lock knob and tension adjusting knob) and fine focusing (0.002mm)
Illumination halogen
Brightness adjustment yes
Power supply 220±22V 50Hz AC network
Light filters yes
Operating temperature range °C 5 — 35
Weight kg 8
Dimensions mm 200x436x400
Ability to connect additional equipment phase contrast device (condenser and objectives) darkfield condenser (dry or oil) polarization devices (polarizer and analyzer)
Head inclination angle 30 °
User level experienced users professionals
Assembly and installation difficulty level complicated
Application laboratory/medical
Illumination location lower
Research method bright field
Pouch/case/bag in set dust cover
Eyepiece tube diameter mm 30
Light source type 12V/30W halogen bulb G4
Magnification x 40–1000 basic configuration (*optional: 40–1200/1250/1500/1600/2000/2500)
Eyepieces 10х/22mm eye relief: 10mm (*optional: 10x/22mm with scale 12.5x/14; 15x/15; 20x/12; 25x/9)
Working distance mm 21 (4x); 5 (10x); 0.66 (40xs); 0.36 (100xs); 8.8 (20x); 0.465 (60xs)
Stage features two-axis mechanical stage without a positioning rack
Magnification range from 800x to 1280x
Nozzle Gemel head (Siedentopf 360° rotation)

Returns Policy

We have a 14-day return policy. If you are not satisfied with your purchase, please return it in its original packaging and be sure to put the original product packaging inside the shipping box to avoid any damage..

All items must be in their original condition and unused. The value of your purchase will be refunded. .

Shipping charges will not be refunded.

If the return is due to a defective product, you may be compensated for the return shipping.

Please contact us for more details if you need to make a return..


- From 0 to 2 kg - shipping cost: 12,50 euros.

- From 2.001 kg to 30 kg - shipping cost: 17,00 euros.

- From 30,001 kg - shipping cost: 30,00 euros.

In case of collection at our warehouse or resale points - the shipping is free.

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