What to Look for in Metallurgical Microscopes

Metallurgical microscopes are considered instruments for measuring thin films and electroplate coatings, surface defects, grain size and inclusions. These microscopes also have various industrial applications such as crystallography, microstructure analysis, thin film measurement, silicon wafer manufacturing, microscopic analysis of opaque surfaces, historical preservation, metallurgy, Stone Age artifacts, sand castings in iron foundries, and others.

The versatility of metallurgical microscope in several industries makes it the tool of the trade. So, what do you need to look for when searching for a metallurgical microscope?

There are certain factors to consider when scouting for metallurgical microscopes. But your must know the specific requirements of your company or industry in order to find a custom fit instrument.

When it comes to manufacturers or brand names, there are leading companies that manufacture specialty microscopes. It doesn’t matter which company or brand you choose, it’s the quality and performance that are most important.

Here are some of the most important features of a metallurgical microscope that you should look for:
- A good metallurgical microscope should have good lighting that shines through mounted, translucent specimens.
- For non-translucent specimens, your choice of microscope should be able to shine light through the objectives onto the specimen’s surface at high magnifications.
- If you are looking for a metallurgical microscope for industrial use, if possible, look for brands with combination of transmitted and incident illumination in all possible modes; though this is not always necessary, but at least one of the illumination modes.
- If you are looking for a metallurgical microscope for routine surface examination at high magnification, look for models or brands that have a mechanical stage equipped with a 100mm by 100mm travel and a 30 watt halogen illumination.
- If you opt for metallurgical microscope for viewing specimens in either darkfield or brightfield illumination, you should look for an incident light only metallurgical microscope. This model comes with a mechanical stage of 100mm by 100mm travel and has a 50 watt halogen illumination.
- For a more versatile choice, look for a metallurgical microscope that uses both transmitted and incident brightfield illumination. This model comes with a mechanical stage of 100mm by 100mm travel and a 30 watt incident illumination.
- For metallurgical microscopes with both darkfield and brightfield observation capabilities, choose a scope that has 30 watts halogen transmitted illumination and a 50 watts incident illumination.
- If you have quality concerns, make sure to look for the ISO 9001 manufacturing standards seal of approval.
- Check for precision ground glass lens.
- Check for the stability and built of the microscope’s housing; make sure to check it is metal.
- Look for warranty and make sure it is a manufacturer’s warranty.

Other features to look for:
- Polarizing light which uses epi-illumination that can enhance surface viewing
- Trinocular eyepieces for precision magnification
- Magnification specs of 100x, 250x, 400x, and 1000x
- Widefield 10x should be included in the eyepiece set
- Objectives: 10x, 25x, 40x and 100x
- High power 40x and 100x magnification objective lenses should be spring-loaded to prevent scratching and damage
- Drop-in filter holder
- Three colored filters: blue, green and yellow
- Adjustable iris diaphragm
- Condenser aligner knobs
- Fine and coarse coaxial focusing knobs on both sides of the metallurgical microscope
- Centering knobs for light source
- Rotatable 45-degree inclined trinocular head
- Adjustable inter-pupillary distance of 55 to 75 mm
- Available diopter adjustment for vision correction
- Photography port that enhances the imaging and magnifying of specimens
- Computer compatibility and digital imaging
- Video and Photo capabilities

There are some instances that you might need to use a hand-held metallurgical microscope. These microscopes are designed for mounting on surfaces at an angle. Digital cameras can also be used to capture images of magnified surfaces that allow image transfer and downloading into a computer much easier.
Hand-held metallurgical microscope special features:
- Hand-held feature allows in-situ magnification and imaging
- Can be mounted on ferrous metals at any angle via magnetic stand
- Convenient inspection due to X-Y axis movement
- Photography convenience
- Non-invasive or non-destructive examination of specimen
- Standard features:
- 10x and 12.5x eyepieces
- 10x and 40x objective lenses
- Illuminator
- Power supply
- Added features/accessories:
- Stand (can be used for smaller sample specimens)
- Digital camera
- Digital camera adaptor
- 4x photo eyepiece
- 20x and 25x objective lenses
- Mini grinder
- Bulb (for illuminator)
No matter what type of metallurgic microscope you chose, it is best to look for a model that has more purpose-specific features to also allow versatility. If you can find a model that has all of the above qualities, then you are sure to have hit the gold mine.