When to buy electron microscopy services from a laboratory and when to own the instrument: what the transmission electron microscope vs scanning electron microscope question really decides about specimen preparation and answer type, what to check before buying from a list of electron microscopes for sale or a transmission electron microscope for sale, why an atomic force microscope price is quoted so far apart between suppliers and what an atomic force microscope afm adds that an electron beam cannot, and where scanning acoustic microscopy answers a question about what is inside a sealed part that no surface method reaches, including the tem vs sem comparison in the shorthand most buyers use for it

The questions that settle send-out against ownership

1. How many samples, and how predictably. A steady, high volume of similar samples favours ownership because the marginal cost of each answer falls. Sporadic work on varied samples favours a service laboratory, which already has the preparation routes, the standards and the interpretation experience for material it sees constantly.
2. Who prepares the specimen. Preparation is most of the skill and most of the failure. Coating, sectioning, thinning and mounting each have their own equipment and their own learning curve, and an instrument bought without that capability produces poor images from good samples. This is the question that sinks most owned instruments.
3. What the answer has to be. Surface shape and composition, internal structure at high resolution, and true surface height are three different answers from three different instrument families. Deciding which answer is needed usually narrows the choice faster than any comparison of specifications does.
4. Environment and siting. Vibration, stray magnetic fields, acoustic noise and temperature stability all limit what an instrument achieves, and a site survey before purchase is cheaper than remediation afterwards. A service laboratory has already solved this, which is part of what its fee buys.
5. The full cost of running it. Service contracts, consumables, preparation equipment, room conditioning and staff time are the recurring costs, and together they usually exceed the amortised purchase. Price them over the expected life before comparing with a per-sample service fee.

Choosing between the two electron instrument families

One family scans a focused beam across a surface and builds an image from what comes back, giving shape, texture and, with the right detector, elemental composition. It takes bulk specimens with modest preparation, which is why it is the more common laboratory instrument.

The other passes the beam through an extremely thin specimen and images what survives the journey, giving internal structure at far higher resolution. The preparation is the hard part: producing a specimen thin enough and representative enough is a specialised skill, and it is the reason this work is so often sent out.

Scanning probe work and what it adds

A probe instrument measures a surface by touching it, producing true height data rather than an image of brightness. That makes it the answer when roughness, step height or mechanical properties are the question, and it works in air or liquid on specimens that would not survive a vacuum.

Quoted prices vary enormously because the instruments do. A basic imaging system and one configured for mechanical property mapping, electrical measurement or work in liquid are different purchases sharing a name, so any comparison has to start from the modes required rather than from the headline figure.

Buying a used instrument

Large instruments come onto the market when a laboratory closes or upgrades, and the headline price can be very attractive. The costs that follow are decommissioning, transport, recommissioning, a service contract on an older platform and, frequently, an obsolete control computer.

Before committing, establish that the manufacturer will still support it, what a service contract costs, what the detectors' condition is, and whether the control software runs on a supported system. Ask to see it producing images on your own material before it is moved, because once it is dismantled nobody can tell you what it was capable of.

The comparison in one paragraph

One family scans a focused beam across a surface and builds an image from what comes back, giving topography, texture and, with the right detector, elemental composition on a bulk specimen with modest preparation. It is the more common laboratory instrument for that reason.

The other passes the beam through an extremely thin specimen and images what survives, giving internal structure at far higher resolution. The preparation is the hard part and is why the work is so often sent out, and the two answer different questions rather than competing.

Common questions

Which electron instrument do I need?

If the question is about a surface, its texture or its composition, the scanning family and modest preparation. If it is about internal structure at high resolution, the transmission family and specialised thin-section preparation, which is the part most laboratories send out.

Is owning cheaper than sending samples out?

Only at a steady, high volume with in-house preparation and interpretation. Count the service contract, consumables, preparation equipment, room conditioning and staff time over the instrument's life before comparing with a per-sample fee.

What does a probe instrument add?

True height data and mechanical or electrical properties, in air or liquid, on specimens that would not survive a vacuum. It answers questions about surface topography and material behaviour that an image of brightness cannot.

Which of the two do I need?

Surface topography, texture or composition on a bulk sample: the scanning family, with modest preparation. Internal structure at high resolution: the transmission family, with specialised thin-section preparation that is usually sent out.

Browse by service class

• Compare Gene synthesis on advertised prices