20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece

5/1 Years
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
  • 20X LED Portable Shop Field Inspection Measuring Microscope + Pen Light and Reticle Eyepiece
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Quick Overview
Finite. Total Magnification: 20X. 10X Eyepiece. 2X Achromatic Objective. Eyepiece Field of View: Dia. 10mm. Illumination Type: LED Reflection Light. Top Illumination: Oblique Top Light.

Suggested Applications
Environmental , Field Research, Industrial , Paper Industry

PM24010111 20X Portable Measurement Microscope
Optical System Specifications
Optical SystemFinite
Mechanical Tube Length160mm
System Optical Magnification20X
Expandable System Optical Magnification (Optional Parts Required)20X/30X/40X/60X
Total Magnification20X
Standard Eyepiece10X Eyepiece
Standard Objective2X Achromatic Objective
System Field of View Dia. 5mm
Eyepiece TypeReticle Eyepiece
Eyepiece Optical Magnification10X
Plan EyepiecePlan Eyepiece
Eyepiece Field of View Dia. 10mm
Reticle TypeSingle Line
Scale Range8mm/8 Div
Objective Optical SystemFinite
Objective Optical Magnification2X
Objective TypeAchromatic Objective
Objective Outer Diameter Dia. 21.5mm
Microscope Stand
Vertical Post Height95mm
Focus ModeManual
Focus Distance10mm
Coarse Focus Distance per Rotation1mm
Mechanical Micrometer Head
Digital Micrometer Head Resolution0.01mm
Digital Micrometer Head Accuracy0.005mm
Microscope Illuminator
Illumination TypeLED Reflection Light
Top IlluminationOblique Top Light
Top Illumination TypeLED
Power Supply
Other Parameters
Surface TreatmentSpray Paint
Net Weight0.45kg (0.99lbs)
Dimensions90x45x128mm (3.543x1.772x5.039 in. )


Technical Info

Portable MicroscopeClose Λ
Portable microscope is the general term for microscopes that are simple in design, easy to carry and convenient for field observation. It usually does not refer to a certain kind of microscope.

Portable microscope is simple in design, but also like a microscope, there is at least one eyepiece and one objective lens, or is imaged by a camera, and has a stand and focusing device. Most of them can also be connected to a camera or an eyepiece camera, and then connect the monitor or store digital images.
Portable microscope generally adopts hand-held operation, and has simple configuration, fixed working distance, convenient for quick observation. Generally, portable microscope has a light source with a battery, which is convenient to carry to work place and field work, and is suitable for application of various industries and scenarios.
FiniteClose Λ
Microscopes and components have two types of optical path design structures.
One type is finite optical structural design, in which light passing through the objective lens is directed at the intermediate image plane (located in the front focal plane of the eyepiece) and converges at that point. The finite structure is an integrated design, with a compact structure, and it is a kind of economical microscope.
Another type is infinite optical structural design, in which the light between the tube lens after passing the objective lens becomes "parallel light". Within this distance, various kinds of optical components necessary such as beam splitters or optical filters call be added, and at the same time, this kind of design has better imaging results. As the design is modular, it is also called modular microscope. The modular structure facilitates the addition of different imaging and lighting accessories in the middle of the system as required.
The main components of infinite and finite, especially objective lens, are usually not interchangeable for use, and even if they can be imaged, the image quality will also have some defects.

The separative two-objective lens structure of the dual-light path of stereo microscope (SZ/FS microscope) is also known as Greenough.
Parallel optical microscope uses a parallel structure (PZ microscope), which is different from the separative two-object lens structure, and because its objective lens is one and the same, it is therefore also known as the CMO common main objective.
Mechanical Tube LengthClose Λ
For objective lens design of finite microscope, its mechanical tube length is the distance from the objective nosepiece shoulder of the objective lens to the eyepiece seat in the tubes, that is, the eyepiece shoulder.

There are two standards in the traditional microscope structure, namely, DIN and JIS. DIN (Deutsches Institute fur Normung) is a popular international standard for microscopes, using 195mm standard conjugate distance (also known as object to primary image distance, 36mm objective lens parfocal distance, and 146.5mm optical tube length.
JIS (Japanese Industrial Standard) is a standard adopted by some Japanese manufacturers, using 160mm standard conjugate distance (also known as object to primary image distance), 45mm objective lens parfocal distance), and 150mm optical tube length.

Using the same microscope standard design, the objective lenses can be used interchangeably.
System Optical MagnificationClose Λ
The magnification of the objective lens refers to the lateral magnification, it is the ratio of the image to the real size after the original image is magnified by the instrument. This multiple refers to the length or width of the magnified object.
System optical magnification is the product of the eyepiece and the objective lens (objective lens zoom set) of the optical imaging part within the system.
Optical magnification = eyepiece multiple X objective lens/objective lens set

The maximum optical magnification of the microscope depends on the wavelength of the light to which the object is illuminated. The size of the object that can be observed must be greater than the wavelength of the light. Otherwise, the light cannot be reflected or transmitted, or recognized by the human eye. The shortest wavelength of ultraviolet light is 0.2 microns, so the resolution of the optical microscope in the visible range does not exceed 0.2 microns, or 200 nanometers. This size is converted to the magnification of the microscope, and it is the optical magnification of 2000X. Usually, the compound microscope can achieve 100X objective lens, the eyepiece is 20X, and the magnification can reach 2000X. If it is bigger, it will be called "invalid magnification", that is, the image is large, but the resolution is no longer increased, and no more details and information can be seen.
Total MagnificationClose Λ
Total magnification is the magnification of the observed object finally obtained by the instrument. This magnification is often the product of the optical magnification and the electronic magnification.
When it is only optically magnified, the total magnification will be the optical magnification.

Total magnification = optical magnification X electronic magnification
Total magnification = (objective X photo eyepiece) X (display size / camera sensor target )
System Field of ViewClose Λ
Field of View, is also called FOV.
The field of view, or FOV, refers to the size of the object plane (i.e., the plane of the point of the observed object perpendicular to the optical axis), or of its conjugate plane (i.e., object to primary image distance), represented by a line value.
System field of view is the size of the actual diameter of the image of the terminal display device of the instrument, such as the size of the image in the eyepiece or in the display.

Field of view number refers to the diameter of the field diaphragm of the objective lens, or the diameter of the image plane formed by the field diaphragm.
Field of view number of objective lens = field of view number of eyepiece / (objective magnification / mechanical tube length)

Large field of view makes it easy to observe the full view and more range of the observed object, but the field of view (FOV) is inversely proportional to the magnification and inversely proportional to the resolution, that is, the larger the field of view, the smaller the magnification, and also the lower the resolution of the object to be observed.
There are usually two ways to increase the field of view, one is to replace with an objective lens of a smaller multiple, or to replace with an eyepiece of a smaller multiple.
Reticle EyepieceClose Λ
Reticle eyepiece. The eyepiece focal length (10mm below the eyepiece mounting surface eyepiece shoulder) of the reticle eyepiece is equipped with a reticle for measuring and positioning the object to be observed.
For one microscope, a reticle can be installed only on one eyepiece, and it requires that the two eyepieces should be completely identical. If two are installed, it is generally very difficult to make the two reticles of both the left and the right eyepiece completely overlap, which may cause eye discomfort.
The reticle eyepieces are generally used on 10X and 20X eyepieces.
The mounting dimension of the reticle refers to the size of the inner diameter of the lower end tube of the eyepiece. It requires that the eyepiece that can be equipped with a reticle needs a preset thread and a pressing ring. The reticle is facing up (in the direction of the eyepiece lens), placed flat on the reticle mounting surface of the eyepiece, and screwed in with a pressure ring, and press tight. Ordinary users can also install the reticle on their own as needed.
The reticle is generally made of glass material, and the etched printed surface is the front side. It is mounted on the end close to the eye, which is the position of the eyepiece image plane; when avoiding the use of different reticle, the focal length is different due to the different thickness of the glass, which makes the scribe line of the reticle fall on the unclear image plane position.

The reticle is placed under the eyepiece. When measuring the object, the reticle and the object to be measured are also magnified by the eyepiece, so the actual length of the reading has no relation at all with the magnification of the eyepiece.
When the reticle reads the length value in the eyepiece of the microscope, because the length of the image to be measured passes through the objective lens and reaches the image plane position of the reticle, the length read is actually the length magnified by the objective lens. The real numerical value should be the length of the reading, divided by the numerical value of magnification of the objective lens. If it is the zoom microscope body with also magnification, it should also be divided by the magnification (objective lens X zoom).
In this measurement method, the error mainly lies in that the magnification of the objective lens is not calibrated, and the magnification error of ordinary microscope objective lens can reach +-5%. Therefore, for accurate measurement, it should be used after calibration with the objective micrometer. For the calibration method, please refer to the introduction of “Reticle”.
Eyepiece Optical MagnificationClose Λ
Eyepiece optical magnification is the visual magnification of the virtual image after initial imaging through the eyepiece. When the human eye observes through the eyepiece, the ratio of the tangent of the angle of view of the image and the tangent of the angle of view of the human eye when viewing or observing the object directly at the reference viewing distance is usually calculated according to 250 mm/focal length of eyepiece.
The standard configuration of a general microscope is a 10X eyepiece.
Usually, the magnification of the eyepiece of compound microscope is 5X, 8X, 10X, 12.5X, 16X, 20X.
As stereo microscope has a low total magnification, its eyepiece magnification generally does not use 5X, but can achieve 25X, 30X and other much bigger magnification.
Eyepiece Field of ViewClose Λ
The eyepiece field of view is the diameter of the field diaphragm of the eyepiece, or the diameter of the image plane of the field diaphragm imaged by the field diaphragm.
The diameter of a large field of view can increase the viewing range, and see more detail in the field of view. However, if the field of view is too large, the spherical aberration and distortion around the eyepiece will increase, and the stray light around the field of view will affect the imaging effect.
Objective Optical MagnificationClose Λ
The finite objective is the lateral magnification of the primary image formed by the objective at a prescribed distance.

Infinite objective is the lateral magnification of the real image produced by the combination of the objective and the tube lens.
Infinite objective magnification = tube lens focal length (mm) / objective focal length (mm)

Lateral magnification of the image, that is, the ratio of the size of the image to the size of the object.
The larger the magnification of the objective, the higher the resolution, the smaller the corresponding field of view, and the shorter the working distance.
Objective TypeClose Λ
In the case of polychromatic light imaging, the aberration caused by the light of different wavelengths becomes chromatic aberration. Achromatic aberration is to correct the axial chromatic aberration to the two line spectra (C line, F line); apochromatic aberration is to correct the three line spectra (C line, D line, F line).
The objective is designed according to the achromaticity and the flatness of the field of view. It can be divided into the following categories.

Achromatic objective: achromatic objective has corrected the chromatic aberration, spherical aberration, and comatic aberration. The chromatic portion of the achromatic objective has corrected only red and green, so when using achromatic objective, yellow-green filters are often used to reduce aberrations. The aberration of the achromatic objective in the center of the field of view is basically corrected, and as its structure is simple, the cost is low, it is commonly used in a microscope.

Semi-plan achromatic objective: in addition to meeting the requirements of achromatic objective, the curvature of field and astigmatism of the objective should also be properly corrected.
Plan achromatic objective: in addition to meeting the requirements of achromatic objectives, the curvature of field and astigmatism of the objective should also be well corrected. The plan objective provides a very good correction of the image plane curvature in the field of view of the objective, making the entire field of view smooth and easy to observe, especially in measurement it has achieved a more accurate effect.

Plan semi-apochromatic objective: in addition to meeting the requirements of plan achromatic objective, it is necessary to well correct the secondary spectrum of the objective (the axial chromatic aberration of the C line and the F line).
Plan apochromatic objective: in addition to meeting the requirements of plan achromatic objective, it is necessary to very well correct the tertiary spectrum of the objective (the axial chromatic aberration of the C line, the D line and the F line) and spherochromatic aberration. The apochromatic aberration has corrected the chromatic aberration in the range of red, green and purple (basically the entire visible light), and there is basically no limitation on the imaging effect of the light source. Generally, the apochromatic aberration is used in a high magnification objective.

Mechanical Micrometer HeadClose Λ
The micrometer head can be divided into two types: mechanical micrometer, and electronic micrometer. Mechanical type is a micrometer head that measures the length of displacement through the thread principle. When used in platform, micrometer head has two functions, one is to generate displacement as the drive platform, and the other is to measure the reading in the displacement.

The mechanical micrometer head is a micrometer adjustment device that measures the length using the thread principle and has a measurement resolution of up to the micron level with an accuracy of 0.01 mm.. Mechanical micrometer head is also called micrometer head, spiral micrometer, micrometer.
In experiment, micrometer head is a tool used to generate displacement and indicate the amount of the displacement. The mounting sleeve of the micrometer head is to facilitate fixed mounting on the stand base. The main ruler on the axial sleeve has two rows of scale lines: the row that is marked with number is the whole millimeter line (1mm/grid); the other row is the half mm line (0.5mm/grid); the circumferential surface of the front part of the micrometer tube is engraved with 50 equal mark lines (0.01 mm/gird).
When the micrometer tube or the fine focus knob is rotated by hand, the measuring rod advances or retreats along the direction of the axis. For every 1 gird rotated by the micrometer tube, the measuring rod moves a small displacement of 0.01 mm along the axial direction, which is also called the graduation value of the micrometer head. The micrometer head reading method is to read the scale value exposed on the main ruler of the sleeve first, pay attention to the half-millimeter line; then read the numerical value on the micrometer tube aligned with the horizontal line of the main ruler, and 1/10 graduation can be estimated.
PackagingClose Λ
After unpacking, carefully inspect the various random accessories and parts in the package to avoid omissions. In order to save space and ensure safety of components, some components will be placed outside the inner packaging box, so be careful of their inspection.
For special packaging, it is generally after opening the box, all packaging boxes, protective foam, plastic bags should be kept for a period of time. If there is a problem during the return period, you can return or exchange the original. After the return period (usually 10-30 days, according to the manufacturer’s Instruction of Terms of Service), these packaging boxes may be disposed of if there is no problem.

More Info

Parts Including
Desiccant Bag1 Bag
Product Instructions/Operation Manual1pc
Packaging TypeCarton Packaging
Packaging MaterialCorrugated Carton
Packaging Dimensions(1)23x14.5x7.5cm (9.055x5.709x2.953″)
Inner Packing MaterialPlastic Bag
Ancillary Packaging MaterialsStyrofoam
Gross Weight0.68kg (1.50lbs)
Minimum Packaging Quantity1pc
Transportation CartonCarton Packaging
Transportation Carton MaterialCorrugated Carton
Transportation Carton Dimensions(1)23x14.5x7.5cm (9.055x5.709x2.953″)
Total Gross Weight of Transportation(kilogram)0.68
Total Gross Weight of Transportation(pound)1.50
Quantity of One Transportation Carton1pc

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