Walk into an automated lab and the sheer variety of devices is dizzying: pipetting robots, arms, centrifuges, sealers, plate readers, shakers, balances, barcode scanners. Every one of them is a complex system in its own right, with its own quirks, limits and hard-won operating knowledge. This isn’t an attempt to flatten that.

It’s a framework for thinking about it. Because when you step back, most lab devices are built to do one of three jobs:

• Liquid handling — aspirating, dispensing, transferring, washing.
• Material handling — moving, heating, cooling, shaking, sealing, storing the plates and tubes.
• Measure — reading, weighing, imaging, scanning.

That’s the lens. It won’t capture everything about any single device, but it’s a useful way to orient yourself in an unfamiliar lab.

Why three, and not thirty

You could sort automation hardware by vendor, by price, by size, or by a long list of device types. The long list tends to fall apart, because the devices that matter most refuse to sit in one box.

A Hamilton STAR is a liquid handler — but it also carries an arm that moves plates, and with the right modules it heats and shakes them too. Is it a “liquid handler” or a “plate mover”? It’s comfortably both, which is exactly why a single label struggles.

So instead of asking what is this device, it helps to ask what can it do. A device isn’t filed under one type; it’s tagged with each job it performs. The STAR moves liquid and handles samples. A heater-shaker both warms a plate and shakes it. A plate reader measures a few different ways and opens a drawer to accept the plate. One device, several jobs — and that’s the common case, not the exception.

Three broad jobs, each device tagged with the ones it does — that tends to scale to a large catalogue without forcing an awkward choice.

The three jobs, up close

Liquid handling. The heart of most automation: getting the right volume from one place to another. Channel pipetting, 96-head pipetting, pumps, bulk dispensers, plate washers — different mechanisms, same underlying job.

Material handling. Much of what you do to the physical plate or tube and its contents other than moving liquid or reading it out. This tends to be the broadest group: robotic arms and storage systems that transport plates; centrifuges, shakers and tilters that agitate them; heaters, coolers, humidity and fan control that condition them; sealers and peelers that close and open them.

Measure. Turning a sample into a number or an image. Absorbance, fluorescence and luminescence readers; balances that weigh; microscopes that image; barcode scanners that read identity.

Where it gets interesting

The honest part of any framework is its edges, and this one has a few worth naming.

A barcode scanner reads a value off a plate, so it sits most naturally under measuring — even though what it produces is an identity, not a quantity. A plate reader’s loading drawer moves the plate in and out, so that drawer looks like sample handling, even though it lives inside a measurement instrument. And a pump usually pushes liquid, though the same hardware can sometimes drive air or vacuum.

None of this breaks the framework — it’s rather the point of tagging over filing. A device that straddles two jobs simply wears two tags, and you find it under either one. Where you’d draw the line is a judgement call, and reasonable people can disagree; the value is in having a shared vocabulary to disagree in.

The point

Held loosely, three jobs turn an intimidating catalogue into something you can reason about. Rather than memorising device categories, you can start from a simpler question: do I need to move liquid, handle materials, or measure something? From there, the relevant hardware — including the devices that quietly do all three — is much easier to find, compare and learn.