Choosing the right microscope can feel overwhelming, especially with so many microscope types, magnifications, optical configurations and features available. The best microscope isn't necessarily the most powerful or expensive - it’s the one that is best suited to your sample, application and budget.
In this microscope buying guide, we’ll explain the key factors to consider, from choosing between compound, stereo and digital microscopes to selecting the right magnification, viewing setup and features for your needs.
Microscope Types
For a basic understanding; there are two different variations of microscopes:
Compound Microscopes (Upright & Inverted)
Compound microscopes can be split into two distinct options - upright and inverted.
An upright microscope is designed for the objectives to sit above the specimen and the light source is below the stage, shining upward through the sample. This can also be adjusted to allow reflected light illumination of the sample, via the addition of a reflected light turret.
An inverted microscope is designed so the objectives sit below the stage pointing upward, while the light source and condenser are above the specimen, shining downward. This flipped geometry makes inverted microscopes ideal for cell culture, live‑cell imaging, and large sample containers such as Petri dishes, flasks, and multi‑well plates.
Stereo microscopes
Stereo microscopes can be separated into two different classes, depending on the optical design.
The first class is Greenough, where tilted optical paths and objectives give the stereo effect. This allows for higher NA optics, and they are generally lower magnification.
The second class is CMO or Common Main Objective, where there are two parallel light paths with one common main objective. This allows for interchangeable main objectives and higher overall magnification.
Both options have their advantages and disadvantages. When considering which option is best, you need to decide what you would like to do with the system. If you are looking to use the system for measurement, you may want to consider the CMO option. If you would like higher DOF (depth of field), you may want to consider the Greenough option.
Some applications will require a set magnification with no requirement for additional magnification. Stone setting for example typically requires 10X or 20X and therefore a single magnification stereo microscope is usually most suitable.
Other applications will require a number of low magnifications to fully inspect and control quality. PCB and PCB track inspections for example typically require 20X and 40X magnifications. Dual magnification or stereo zoom microscopes are most suited to these applications.
The Steps To Choose A Microscope
First, decide what you’d like to look at.
The best place to start is with your samples and specimens. This will help guide you to the option most suitable for you.
For larger samples that aren’t on a slide or over 15 x 15 x 4cm, or samples in larger containers such as petri dishes or well plates, a stereo or inverted microscope may be your option.
If your samples are on a slide or smaller than 15 x 15 x 4cm, an upright or inverted microscope are good options.
Secondly, once you have narrowed down your options, the next aspect to consider is the magnification requirements to image the full detail of your sample. Here you need to consider the smallest detail you would like to be able to resolve.
From this, a rough magnification range can be established and therefore whether a "high magnification" (typically a compound microscope) or "low magnification" (typically a stereo microscope) is required.
Low magnification microscopes typically offer 7X - 45X magnification. These are used for applications such as PCB inspection, jewellery and diamond inspection, engraving, studying insects, etc.
High magnification/compound microscopes will usually offer between 40X - 1000X magnification, which is suitable for studying cells, bacteria, pond water etc.
You will notice that until this point, we have not discussed digital microscopes. This is because they will cater for both high and low magnification requirements. A digital microscope is essentially a combination of a microscope and a camera - either literally an optical microscope combined with a camera to convert it into a digital microscope, or a microscope with a built-in camera system.
Finally, consider the weight of the sample itself. Compound microscopes, whether this is upright or inverted, have a weight limit the system is designed for, which is mainly determined by the stage. If your samples are too heavy you will cause damage to the focus mechanisms or stages. If this is the case, you may want to consider using a combination of microscopes to allow you to obtain an overview of the sample, and then section the sample down into smaller parts to do the higher magnification imaging. With compound and stereo microscopes, there are differences in the performance depending on your samples.
Time Spent Using The Microscope
After you have decided on the type of microscope best suited to your needs, the next point to consider is how long are you going to be using the microscope.
For most, a binocular headed microscope (with two eyepieces) is more comfortable to use for longer periods of time. Monocular headed microscopes (with only one eyepiece) are useful for quick inspections, are frequently seen in schools.
It is also worth considering whether a camera attachment would be beneficial now, or later in the future. Many microscopes do not allow retro fitting of dedicated camera ports (trinocular ports or photo ports), so if you are likely to want to attach a camera at any point in the future, it is recommended that a trinocular headed microscope be purchased from the start to avoid the additional expense later down the line.
It is possible to bypass this by using an eyepiece camera that slots into the eyepiece tube in replace of one of the eyepieces, however this does have its limitations (one example being that you can't view down the eyepieces at the same time as using the camera).
Quality, Price and Choosing a Reputable Supplier
Price and quality often go hand in hand when choosing a microscope. While it can be tempting to select the cheapest option available, a lower purchase price can sometimes mean compromises in the quality of the optics, mechanical components, or construction. These differences may not always be obvious when comparing specifications, but they can have a significant impact on the microscope’s performance, reliability and lifespan.
This does not mean that you need to choose the most expensive microscope either. The aim is to find the right balance between quality, performance and price for your application.
Buying from an established and reputable microscope supplier can make this decision much easier. A specialist supplier should be able to help you select equipment based on how you actually intend to use it, rather than simply recommending the highest specification or most expensive model. It also means you have somewhere to turn for technical advice, servicing, repairs and support after your purchase.
At GT Vision, we have over 20 years of experience supplying microscopes and imaging equipment to customers across education, research, healthcare and industry. We offer a wide range of equipment from established manufacturers, alongside our own GX Microscopes range, giving customers options across different applications and budgets.
Our GX range is designed to provide high-quality, reliable microscopy at competitive prices, without unnecessary features that add to the cost. For customers who require specialist equipment or particular optical performance, we also supply leading brands including Leica, Evident, Nikon, Meiji, Motic and Euromex, alongside a wide range of cameras, accessories and imaging solutions.
We also provide more than just the microscope itself. Our UK-based team can offer advice on product selection, technical support, installation, training, servicing, calibration and repairs. This ongoing support can be particularly valuable when purchasing equipment for a laboratory, school, university or business where reliability and long-term usability are important.
Ultimately, the cheapest microscope is not necessarily the best value, and the most expensive microscope is not necessarily the right choice. Look for a supplier that can offer a suitable range of quality equipment at different price points, along with the expertise and after-sales support to help you get the most from your investment.
Summary
Choosing the right microscope starts with understanding what you need to look at, how much detail you need to see, and how you intend to use the equipment. From compound and stereo microscopes to digital systems, each type has different strengths and is suited to different samples and applications.
Consider your sample size, required magnification, working time, camera requirements, sample weight and budget before making your decision. Just as importantly, consider the support available after your purchase. A microscope is a long-term investment, so choosing a reputable supplier with the expertise to advise you, provide quality equipment and support you throughout its lifespan can make a significant difference.
Still unsure which microscope is right for you? Get in touch with our team for expert advice on choosing the right microscope for your needs.