We get asked about otoscopes more than almost anything else we sell. Usually the question is some version of "which one do I actually need?", and the honest answer is that it depends on who's on the other end of it. A medical student practising on friends, a GP doing twenty ear checks a day and a vet looking down a Labrador's ear canal all want slightly different things.

So here's the plain-English version: what the parts do, what's worth paying for, and what you can safely ignore.

First, what an otoscope actually is

Strip away the jargon and an otoscope is three things: a light, a small magnifying lens, and a cone (the speculum) that goes a little way into the ear canal so you can see the eardrum. Everything else is a variation on those three.

If you're buying a diagnostic set, you'll often get an ophthalmoscope head too, for looking into the eye. Both heads usually share one battery handle, which is why sets are such good value compared with buying the pieces separately.

LED or halogen?

This is the question that matters most day to day.

• LED gives a bright, white light that shows colours more naturally. That matters when you're trying to tell a healthy pearly-grey eardrum from a red, inflamed one. LEDs also last for years and barely touch your batteries.
• Halogen gives a warmer, slightly yellow light. It works perfectly well, and plenty of clinicians trained on it and prefer it, but bulbs do eventually blow and they drain batteries faster.

If you're buying your first otoscope and don't have a strong preference, go LED. If you're used to halogen and like it, there's no reason to switch.

Specula: small parts, big difference

The speculum is the bit that goes in the ear, and getting the right size is more important than most people realise. Too big and it's uncomfortable; too small and you're peering through a pinhole.

Most sets come with a range of sizes, typically from around 2.5mm for small children up to 4mm or more for adults. Reusable ones can be cleaned between patients; disposable ones are quicker and more hygienic in a busy clinic. Check which type your set takes before you order spares.

If you're a vet (or a pet owner)

Animal ear canals are longer and shaped differently to ours, especially in dogs, where the canal drops down and then turns inwards. That's why veterinary otoscopes come with longer specula.

Some vet kits also have an open or "slit" head. Instead of a sealed window, there's a gap you can pass small instruments through, so you can remove debris or take a sample while you're looking. If you'll be doing more than just looking, that's the feature to look for.

What you don't need to worry about

• Huge magnification numbers. Most otoscopes magnify around three times, and that's all you need to see an eardrum clearly.
• Lots of extra attachments, unless you know you'll use them. A good light, a decent lens and the right specula do 95% of the job.

Quick guide: which one for you?

• Students: a complete ENT diagnostic set with otoscope and ophthalmoscope heads. You'll use both on placements, and a set saves money.
• GPs and nurses: an LED otoscope with a good range of specula, built for regular daily use.
• Vets and vet nurses: a veterinary otoscope kit with long specula, ideally with a slit head if you'll be clearing ears.
• First aiders and home use: a compact LED otoscope is plenty. Just remember it's for looking, not diagnosing, so see a professional if something isn't right.

A last word on care

Take the batteries out if the otoscope is going to sit in a drawer for weeks. Wipe reusable specula with an appropriate disinfectant after every use, and keep the lens clean and free of fingerprints. Look after it and a good otoscope will last you years.

You can browse our full range of otoscopes, ENT sets and other diagnostic tools in our Medical & Diagnostic Instruments collection. And if you're still not sure which one suits you, just get in touch. We're happy to help you pick.