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User Manual
Shop Measuring Microscope
Model M51B
MicroscopeNet.com
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Table of Contents
i. Caution.............................................................................................1
ii. Care and Maintenance……….………………………………….….…1
1. Component Illustration………………………….…………..……..…..2
2. Installation……………………………………………………….……...2
3. Operation ….…………………………………………………….……...3
4. Specifications…………………….………………………………….....4
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i. Caution
1. Open the shipping box carefully to prevent any accessory, like eyepieces, from
dropping and being damaged.
2. Do not discard the shipping box. The box should be retained should the
microscope ever requires reshipment.
3. Keep the instrument out of direct sunlight, high temperature or humidity, and dusty
environments. Ensure the microscope is located on a smooth, level and firm
surface.
ii. Care and Maintenance
1. Do not attempt to disassemble any components, like eyepieces, objectives or
focusing assembly.
2. Keep the instrument clean; remove dirt and debris regularly. Accumulated dirt on
metal surfaces should be cleaned with a damp cloth. More persistent dirt should be
removed using a mild soap solution. Do not use organic solvents for cleansing.
3. The outer surface of the optics should be inspected and cleaned periodically using
an air stream from an air bulb. If dirt remains on the optical surface, use a soft cloth
or cotton swab dampened with a lens cleaning solution (available at camera
stores). All optical lenses should be swabbed using a circular motion. A small
amount of absorbent cotton wound on the end of a tapered stick makes a useful
tool for cleaning recessed optical surfaces. Avoid using an excessive amount of
solvents as this may cause problems with optical coatings or cemented optics or
the flowing solvent may pick up grease making cleaning more difficult.
4. Store the instrument in a cool, dry environment. Cover the microscope with the
dust cover when not in use.
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1 Components Illustration
1
2
3
4
1. Eyepiece
2. Eyepiece Tube
5
6
3. Limit Ring
4. Focusing Knob
5. Illumination Rack
7
8
6. Flashlight
7. Thumbscrew
8. Thumbscrew
9
Fig. 1
9. Objective
2 Installation
2.1 Installation of the eyepiece
1) Take off the cap on the eyepiece tube.
2) Insert the eyepiece into the eyepiece tube.
2.2 Installation of the flashlight (Fig.2)
1) Screw on the illumination rack (5); make sure the
holder ring face down.
2) Tighten the screw nut with the wrench provided
as shown in the figure 2.
3) Insert the flashlight (6) into the holder ring.
4) Adjust the angle and position of the flashlight, and then tighten the thumbscrew (7)
and (8).
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Fig. 2
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2.3 Replacement of the objective (Fig.3 – Fig.7)
1) Turn the objective counter clockwise and take it off as shown in Fig.3 to Fig.5.
Fig.3 Fig.4 Fig.5
2) Screw on the objective that you want to use as show in Fig.6 and Fig.7.
Fig.6 Fig.7
3 Operation
3.1 Changing (installing) batteries
1) Take off the cap at the end of the flash light.
2) Put in 2 AAA batteries.
3) Put on and tighten the cap.
3.2 Placing the specimen
1) Clean the surface of the specimen.
2) Put the specimen on a table.
3) Put the microscope on the specimen.
Note: if you are working on the field or the specimen is big, you can put the
microscope on the specimen directly.
3.3 Adjusting limit ring position
1) Put the microscope on a flat surface.
2) Loosen the thumbscrew on the limit ring (3).
3) Turn the focusing knob (14) to lower the objective till the distance between the
objective and surface is less then the working distance.
4) Put the limit ring (3) at its lowest position and tighten its
thumbscrew.
3.4 Focusing
1) Choose the desired the objective and install onto the
microscope.
2) Turn the focusing knob (14) until the specimen is in focus.
3.5 Adjusting eyepiece diopter (Fig.8)
Turn the top part of the eyepiece, until a sharp image is obtained.
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Fig.8
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4 Specifications
Model M51B
Total Magnification 20X, 40X, 100X
Eyepieces W10X/15.5mm, diopter adjustable, with reticle
Reticle
Objectives
Focusing Mechanism Rack and pinion, focusing knobs on both sides, with limit ring
Working Distance
Field of View
Illumination Flashlight, on 2 AAA batteries
Dimension
Net weight 0.7 kg (1lb 8oz)
Scales with crosslines
Division: 50um with 20X; 25um with 40X, 10um with 100X
DIN 2X/0.05, 160/DIN 4X/0.1, 160/0.17
DIN 10X/0.25, 160
15 mm (9/16”) with 20X
16.5 mm (5/8”) with 40X
7.5 mm (5/16”) with 100X
8.5mm with 20X
4.2mm with 40X
1.8mm with 100X
Height: 24 cm (9-1/2”) at highest condition with eyepiece on
Bottom diameter: 6.3 cm (2-1/2”)
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