3D Microscopy for Archaeology: Measuring the Past

Sensofar profilers and GelSight sensors usually live in quality labs. They measure the finish on a turbine blade or the depth of a scratch on a wing panel, and most of the people who buy them have never been near an excavation. So it surprises people to hear the same kit turns up regularly in archaeology journals, where 3D microscopy has become one of the main ways researchers study how artefacts were made and used.

A team in Barcelona used a Sensofar profiler to measure the polish on flint sickle blades from Syria. The texture of that polish showed when people stopped cutting wild cereals and started farming them. Another Spanish group measured cut marks on 18,000-year-old human bones from a cave in Poland and proved they were made with stone tools. And a GelSight sensor, the kind an aircraft inspector carries round a hangar, picked up a potter’s fingerprint from the handle of an ancient pot.

Then there’s the everyday work. Conservators photograph an object before it goes out on loan and check it again when it comes back. The images have to be good enough to show what changed, and that’s where a TAGARNO digital microscope earns its place.

Which instrument fits your work usually comes down to what you want to find out, and whether the object can be touched or moved.

What is 3D microscopy in archaeology?

3D microscopy in archaeology is the measurement of an artefact’s surface height, point by point, at microscopic scale, so that wear, tool marks and manufacturing traces can be described in numbers.

For most of the last century, use-wear and tool-mark analysis meant a trained eye at a stereo or metallographic microscope. Two specialists could look at the same polish and describe it differently. A 3D height map settles the argument. It gives values for roughness and texture under ISO 25178, the same standard engineers use for machined parts, and those values can be tested statistically against experimental reference collections.

What can a digital microscope show you?

A TAGARNO digital microscope puts a live 4K image on a monitor, so everyone in the room sees the same surface at the same moment. A conservator, a curator and a visiting researcher can talk through a crack or a patch of corrosion together, with nobody queuing for an eyepiece.

The TAGARNO T50 runs at 60 frames per second with a magnification range of 1.3x to 660x, covering fields of view from 409 mm down to 0.8 mm. One stand handles a whole tablet or the rim of a single coin. Motorised height adjustment keeps the image sharp as you move across a curved surface.

The software apps are what make it a conservation tool:

• Image comparison puts today’s image beside the last one, so a post-loan condition check is a side-by-side look.

• Focus stacking builds one sharp image from many, which suits rounded pottery, carved stone and struck coins.

• Measurement records crack lengths, pit diameters and inscription heights directly on the image.

• A magnetic UV ring light shows up old retouching, adhesives and coatings that disappear under normal light.

Every image is saved as you go, so the condition record builds itself while you work. It’s also the instrument students and staff reach for every day.

What does a 3D optical profiler add?

A Sensofar 3D optical profiler measures surface topography without touching the object, resolving height differences well below a micron. It combines confocal, interferometry and focus variation in one sensor head, so glossy flint, matte bone and powdery pigment can all be measured on the same instrument.

Its record in archaeology is long, and much of it is written up by the researchers themselves:

• Cereal domestication. The Institució Milà i Fontanals (CSIC) in Barcelona measured sickle gloss on flint blades from the Middle Euphrates, dated between 13,000 and 9,000 years ago. The texture showed wild cereals were being cultivated there long before fully domestic species appear. In 2025 the same institute added reference textures for obsidian and ground stone tools.

• Cut marks on bone. IPHES in Tarragona measures the width, depth and wall angles of cut marks and compares them statistically with marks left by stone tools, carnivore teeth and trampling. At Maszycka Cave in Poland, that confirmed cannibalism among Magdalenian hunter-gatherers around 18,000 years ago.

• Ochre. PACEA in Bordeaux measured ground facets on 40,000-year-old ochre from East Africa and found single pieces had been worked on different grindstones.

• Damage from analysis. PACEA also measured the craters a laser-induced breakdown spectroscopy (LIBS) instrument leaves on a fresco sample. After 20 shots they were about 800 × 400 µm across and 100 µm deep, exactly the data a curator needs before approving a micro-destructive test.

SensoMAP software reports ISO 25178 parameters such as Sa and Sq, along with the scale-sensitive fractal analysis (Asfc) that microwear researchers rely on.

How does a tactile sensor measure an artefact?

A GelSight sensor measures 3D surface texture on any material, in any light, in about half a second. You press a soft elastomer pad against the surface. Its reflective skin takes on the exact shape underneath, and the lights and camera inside the handheld unit turn that impression into a height map.

Because the measurement happens on the pad, the artefact’s own colour and shine make no difference. Obsidian, quartz and polished metal measure as easily as matte stone.

The GelSight Max weighs under 1 kg and runs on its own battery. It captures a 14.6 × 8.3 mm area per measurement, covers a roughness range of 0.2 to 20 µm Ra, and exports STL and CSV files or a finished PDF report.

Two peer-reviewed studies from Poznan University of Technology and Keene State College have put it to work on archaeological material. The 2024 study measured basalt, chert, obsidian and quartz tools and separated used edges from unused ones, picking up micropolish on chert and microabrasion on obsidian. The 2025 study measured a fingerprint preserved on an ancient pottery handle and told it apart statistically from modern prints pressed into clay. The authors name field sites, museums, universities and private collections as natural homes for the instrument.

Which instrument answers which question?

Start from the question, then match the instrument to it.

How would one artefact move through all three?

Take a flint blade from a Neolithic level with a bright band of gloss along one edge. The excavation team wants to know whether it cut cereals, and whether those cereals were ripe.

It goes under the TAGARNO first. Focus stacking gives a sharp image of the whole glossy edge for the finds register, saved as the baseline before any cleaning.

Next, the Sensofar. Small areas of gloss are scanned in confocal mode at 20x and 50x, and the texture parameters are compared with experimental blades used on wild and domestic cereals. That’s the method the CSIC team used on the Euphrates sickles.

A year later the blade is on display in another city, and a second researcher wants a different stretch of edge measured. A GelSight Max travels to the museum in a carry case. Sound flint takes contact without any problem, so the work is done at the conservation bench in a morning.

Look first, measure second. IPHES works the same way, screening marks under the microscope before selected bones go to the profiler.

Can you take the instruments to the object?

All three travel. GelSight is the obvious one: handheld, battery powered and quick enough to measure dozens of locations in a museum store in a single visit. TAGARNO microscopes are light enough to set up on a table in a site house or a store room. Sensofar profilers are transportable too, and the compact S lynx 2 moves easily between labs and sites.

In 2022 Sensofar took S neox and S wide profilers to the Atapuerca excavations in northern Spain and measured finds for researchers during the dig season.

How do you make the case for buying one?

Most archaeology and conservation labs buy through a committee or a grant, so the purchase needs a written case. That’s easier to make than people expect.

• They serve more than one department. Sensofar and GelSight are standard tools in materials science, mechanical engineering and forensic science, and TAGARNO microscopes are used in forensic and materials labs. Sharing splits the cost.

• 3D data strengthens papers and grant bids. Use-wear and taphonomy journals now routinely publish texture parameters alongside images, and reviewers ask for them.

• Students train on the instruments industry uses. That counts when a university reports on graduate skills.

• You can build in stages. Plenty of labs start with a TAGARNO for daily documentation and add 3D measurement when a funded project needs it.

New museums and archaeology programmes across the UAE and Saudi Arabia are equipping labs now. The instruments they choose will shape how they work for the next decade.

What should you prepare before you call?

• The research or conservation question, in a sentence or two

• The materials involved: flint, obsidian, bone, ceramic, metal, pigment or stone

• Object size and weight, and whether it can leave its store or site

• Whether contact with the surface is permitted

• The size of the features you care about, from a crack across a vessel to polish on a 2 mm edge

• A few photographs, with a scale bar if you have one

• Existing images or data you want new results to match

• Other departments that might share the instrument

How AIET Group helps

AIET Group supplies and supports TAGARNO digital microscopes, Sensofar 3D optical profilers and GelSight surface measurement systems across the UAE and Saudi Arabia. We look at your objects and questions, recommend the instrument or combination that fits, and arrange demonstrations on representative material. AIET Group handles installation and training, and every metrology system comes with annual calibration and maintenance, so a lab without metrology staff stays in specification. We also write tender specifications and the technical justification for grant bids.

Speak to AIET Group

Send us a photograph of the object, a sentence on what you want to find out, and whether it can be touched or moved. That’s enough for AIET Group to recommend a route and explain what a demonstration would involve. Images or data from another instrument help too.

Contact the AIET Group sales team to start the conversation.

Frequently asked questions

What is 3D microscopy used for in archaeology?

3D microscopy measures the microscopic surface of an artefact so wear, tool marks and manufacturing traces can be described in numbers. Researchers use it for use-wear analysis on stone tools, cut marks on bone, grinding traces on ochre, and the effects of cleaning or laser analysis. Results are compared statistically against experimental reference collections.

What is the difference between a digital microscope and a 3D optical profiler?

A digital microscope captures high-resolution images, while a 3D optical profiler measures surface height at every point. A TAGARNO microscope is the tool for viewing and documenting condition. A Sensofar profiler turns the same surface into a height map with ISO 25178 roughness and texture parameters. Many labs use the microscope to find features and the profiler to measure them.

Can you measure an artefact without touching it?

Yes, a Sensofar 3D optical profiler measures surface topography using light alone, so nothing touches the object. It handles stone, bone, ceramic, metal and pigment, and published studies have used it on flint sickles, obsidian blades, ochre and human bone. A TAGARNO digital microscope is also fully non-contact for imaging and 2D measurement.

Is GelSight suitable for archaeological artifacts?

Yes, GelSight has been tested on archaeological stone tools and pottery in peer-reviewed studies published in 2024 and 2025. It suits sound surfaces such as flint, obsidian, quartz, basalt and fired clay, where a light touch from the soft gel pad is acceptable. Its big advantage is portability: it measures in a store, a gallery or on site in about half a second.

Which instrument is best for use-wear analysis?

For research-grade use-wear analysis, a Sensofar 3D optical profiler in confocal mode is the established choice, with published reference work on flint, obsidian and ground stone. GelSight adds a portable option for measuring tools where they are kept. Most use-wear labs also run a digital microscope such as TAGARNO to locate and document polish before it is measured.

Can these instruments be used on an excavation?

Yes, all three can be taken into the field. GelSight is handheld and battery powered, TAGARNO microscopes are light enough to set up in a site house, and Sensofar profilers, particularly the compact S lynx 2, are transportable. Sensofar has taken profilers to the Atapuerca excavations in Spain and measured finds during the dig season.

How much does a 3D profiler for archaeology cost?

The price depends on the configuration, objectives and software modules, so AIET Group quotes each system against the work it will do. A TAGARNO digital microscope is the most accessible starting point, while GelSight and Sensofar systems are research instruments. Many labs share the cost across departments or build it into a grant bid.

What should we send AIET Group before a demonstration?

Send a photograph of the object, the question you want answered, and whether the surface can be touched or the object moved. Add the material, the approximate size and the size of the features you are interested in. With that, AIET Group can recommend the right instrument and plan a demonstration on representative material.