What your samples are

Non-conductive, wet, outgassing or beam-sensitive samples point towards variable pressure. Conductive, well-prepared samples do not need it. This single question narrows the range faster than any other.

How large the samples are

Benchtop instruments take specimens up to around 80 mm. Industrial platforms take much larger chambers. A part that cannot be cut down decides the chamber size for you.

The resolution the science actually needs

Teaching, failure analysis and routine QC are well served below the field-emission tier. Sub-nanometre work on semiconductors and advanced materials genuinely needs cold field emission.

A shared teaching instrument used by many students has different demands from a research instrument with one trained operator. Guided interfaces and low preparation matter more in the first case.

Whether you need analysis, not just images

EDX, EBSD, STEM and cathodoluminescence change the specification. Decide at purchase — retrofitting is more expensive than specifying correctly.

Field-emission instruments need stable power, controlled temperature, and low vibration and electromagnetic interference. In many Bangladeshi buildings the site preparation, not the instrument, is the long lead item.

Choosing a scanning electron microscope.

The most common specification mistake in electron microscopy is buying resolution a laboratory will never use, and then discovering the sample it actually needs to image will not fit the chamber or cannot be coated. Resolution is one axis. Sample size, sample condition, throughput, operator skill and the analysis you need alongside imaging matter at least as much. Every instrument below is the right instrument for a particular laboratory — this guide is about matching yours.

What actually drives the decision

What your samples are: Non-conductive, wet, outgassing or beam-sensitive samples point towards variable pressure. Conductive, well-prepared samples do not need it. This single question narrows the range faster than any other.
How large the samples are: Benchtop instruments take specimens up to around 80 mm. Industrial platforms take much larger chambers. A part that cannot be cut down decides the chamber size for you.
The resolution the science actually needs: Teaching, failure analysis and routine QC are well served below the field-emission tier. Sub-nanometre work on semiconductors and advanced materials genuinely needs cold field emission.
Who will operate it: A shared teaching instrument used by many students has different demands from a research instrument with one trained operator. Guided interfaces and low preparation matter more in the first case.
Whether you need analysis, not just images: EDX, EBSD, STEM and cathodoluminescence change the specification. Decide at purchase — retrofitting is more expensive than specifying correctly.
Laboratory services: Field-emission instruments need stable power, controlled temperature, and low vibration and electromagnetic interference. In many Bangladeshi buildings the site preparation, not the instrument, is the long lead item.

What each option is built for

Tabletop Microscope TM4000 Series (Hitachi High-Tech)

Best suited to: Fast imaging with little sample preparation, in a teaching or routine setting.

Typically runs in: University teaching laboratories, polytechnics, and QC benches that need images quickly without a dedicated microscopist.

Benchtop footprint — no dedicated microscope room needed
Little sample preparation required
Takes specimens up to 80 mm across and 50 mm thick
Charge-up reduction mode images conductive and non-conductive samples
Backscattered electron detection, with secondary electron and mixed modes on Plus models

What the site needs: Bench space and a standard laboratory supply. No specialist room preparation.

Full specification for Tabletop Microscope TM4000 Series

FlexSEM 1000 II (Hitachi High-Tech)

Best suited to: Uncoated and outgassing samples that must be imaged as they are.

Typically runs in: Materials, life science and environmental laboratories working with samples that cannot be coated or dried.

Variable pressure chamber for uncoated and outgassing samples
Tungsten filament source
Supports energy dispersive X-ray analysis
Takes STEM specimen holders

What the site needs: A laboratory room with stable services and space for the vacuum system.

Full specification for FlexSEM 1000 II

SU3800 / SU3900 (Hitachi High-Tech)

Best suited to: Industrial and bulky samples, including parts that cannot be cut down.

Typically runs in: Industrial laboratories, failure analysis services and research institutes handling large physical specimens.

Variable pressure operation
Five-axis motorised stage with automated functions
SU3900 chamber takes specimens up to 300 mm diameter
Built for routine work on bulky industrial samples

What the site needs: A dedicated microscope room with floor loading suitable for a large chamber platform.

Full specification for SU3800 / SU3900

SU5000 (Hitachi High-Tech)

Best suited to: General research needing field-emission quality across varied sample types.

Typically runs in: University central facilities and research institutes serving many disciplines from one instrument.

Schottky field emission source with an out-lens objective
Moves between high vacuum and variable pressure operation
EM Wizard interface guides imaging conditions
Drawer-type stage accepts large specimens

What the site needs: A prepared microscope room: stable power, controlled temperature, low vibration and low electromagnetic interference.

Full specification for SU5000

SU7000 (Hitachi High-Tech)

Best suited to: Research where several signals must be collected and compared together.

Typically runs in: Multi-user research groups whose work depends on correlating secondary and backscattered information.

Collects several secondary and backscattered signals simultaneously
Up to six channels displayed and stored together
Schottky field emission source
Optional variable pressure mode widens the sample range

What the site needs: A prepared microscope room with stable services, as for any field-emission instrument.

Full specification for SU7000

SU8600 / SU9600 (Hitachi High-Tech)

Best suited to: Sub-nanometre imaging for semiconductor and advanced materials research.

Typically runs in: National research centres and advanced materials groups where resolution is the object of the work.

Cold field emission source for ultrahigh-resolution imaging
SU8600 upper detector with ExB filter mixes secondary and backscattered signals
SU9600 in-lens objective with ExB detection for good signal-to-noise at low probe current
Optional cathodoluminescence and STEM capability on the SU8600

What the site needs: A purpose-prepared microscope room with tight control of vibration, temperature and electromagnetic interference.

Full specification for SU8600 / SU9600

True of every option above

Supplied, installed and commissioned by Vvon engineers in Bangladesh
Site survey before order, covering power, vibration, temperature and electromagnetic interference
Specification support during tender preparation
Operator and applications training on handover
Annual and comprehensive maintenance contracts available
Consumables, detectors and upgrade paths supported from the same catalogue

Send us a description of the samples you need to image and what you need to measure from them. We will match instruments to that, and where a lower-tier instrument does the job we will tell you — specifying above the requirement wastes budget that is usually better spent on sample preparation and training.