Are Thermal Scopes Waterproof? IP Ratings Explained

Short answer: most quality thermal scopes are water-resistant, not waterproof in the submarine sense. They carry an IP (Ingress Protection) rating that tells you exactly how much dust and water they can take. Rain, dew, fog and humidity are fine within that rating. Dunking a scope past its limit is not.

“Waterproof” is one of those words that gets thrown around loosely in the optics world. It sounds like a promise, but the real information sits in the IP rating printed on the spec sheet. Once you can read that code, you’ll know precisely what your thermal optic will shrug off and what will wreck it. This guide walks through IP ratings in plain English, what the common numbers mean in the paddock, and how to look after seals and lenses so your scope stays sealed for the long haul.

Are thermal scopes waterproof?

They’re water-resistant, and the degree of resistance is defined by the IP rating. There’s no such thing as a universally “waterproof” thermal scope you can treat like a dive torch. What you have is a sealed electronic instrument built to keep dust and water out up to a tested standard.

In practice, that’s more than enough for hunting and pest control. A well-sealed thermal handles a night of steady rain, wet grass, river spray and heavy dew without complaint. Where people get into trouble is assuming “sealed” means “invincible” and fully submerging an optic that was only ever rated for jets or splashes. Respect the rating and the scope will outlast the battery habits of most owners.

What is an IP rating?

IP stands for Ingress Protection. It’s an international standard (IEC 60529) that grades how well an enclosure keeps out solids and liquids. The code has two digits after the letters — for example, IP67.

• First digit (solids/dust): ranges 0–6. A 6 means fully dust-tight — nothing gets in.
• Second digit (water): ranges 0–9. A 6 means protection against powerful water jets. A 7 means temporary immersion (typically to about 1 metre for 30 minutes). An 8 means continuous immersion under conditions the maker specifies.

So a higher second digit is not simply “more waterproof” in a linear way — the tests are different. Curiously, a device rated for immersion (7) isn’t automatically rated for high-pressure jets (6), because those are separate tests. That’s why you’ll sometimes see dual ratings. For a thermal scope, the digits you care about are usually a 6 for dust and either a 6 or 7 for water.

What do common IP ratings mean for a thermal scope?

Here’s how the ratings you’ll actually see translate to real-world use.

Notice the pattern: even the highest ratings come with limits. IP67 doesn’t mean “take it swimming” — it means the seals held during a defined immersion test. Treat it as insurance against accidents, not an invitation.

Important: we won’t quote an exact IP figure for a specific Pixfra model here, because ratings vary by product and can change across generations. Always check the spec on the individual product page before you rely on a number. You’ll find current Pixfra thermal riflescopes and thermal monoculars listed with their published specifications.

Can a thermal scope get wet? Rain, dew, humidity and river crossings

Yes — within its rating, water on the outside is a normal part of the job. Let’s break down the situations you’ll actually meet.

Rain

A scope rated IP66 or IP67 will keep working through rain. Water beading on the objective can soften the image because it scatters the thermal signal, but the electronics stay dry. Wipe the lens gently with a clean microfibre cloth when it pools — never wipe a dry germanium lens hard, as the coatings are delicate. More on that in our thermal lens care and storage guide.

Dew and overnight moisture

Dew is fine. The seals don’t know the difference between rain and a heavy dew. The one habit worth keeping: dry the optic down after a wet night before it goes back in the case, so trapped moisture doesn’t sit against the seals or the battery door.

Humidity

High humidity on its own won’t get inside a sealed optic. What humidity can do is cause external fogging when temperatures swing — covered below.

River and creek crossings

Here’s where the rating really matters. If your scope is IP67, a brief accidental dunk during a crossing shouldn’t kill it — but you should never deliberately submerge it or hold it under. If it’s rated for jets only (IP66 and below), keep it out of the water entirely. When you’re wading, the safest move is to carry the optic high and dry, or stow it in a protective case.

What does IP67 mean in practice for hunters?

IP67 is the sweet spot a lot of serious thermal optics aim for, and it’s a genuinely reassuring rating. It means:

• Dust and grit will not get inside — good news in dry, dusty Australian country.
• An accidental full immersion (a dropped scope in a puddle, a slip at a creek edge) is survivable if you retrieve it promptly and dry it.
• Heavy rain, spray and wet scrub are non-events.

What it does not mean is that the scope is a dive instrument. The immersion test is temporary and shallow. Push past that — depth, time or water pressure beyond the standard — and you’re on your own. Reassurance, not a dare.

Why does my thermal fog up? Condensation explained

Fogging trips people up because it looks like a seal has failed when usually it hasn’t. When you bring a cold optic into warm, humid air — walking from a frosty paddock into a heated ute or a shed — moisture in the warm air condenses on the cold external glass. That’s the same physics as your glasses fogging when you come indoors. It’s surface condensation, not water inside the scope.

The fix is patience: let the optic acclimatise to the new temperature and the fog clears on its own. Internal fogging is a different story and is rare in a properly sealed, nitrogen-purged optic — if you ever see persistent fog inside the lens that won’t clear, that’s a warranty conversation, not a cleaning job. Our guide to thermal in rain and fog digs deeper into what weather does to the image itself.

Weatherproofing versus thermal range: two different things

This is the distinction that catches new buyers out. A scope can be perfectly sealed and still “see” poorly in heavy rain. That’s not a waterproofing failure — it’s physics.

Thermal imaging reads heat differences. Heavy rain, thick fog and high humidity fill the air with water that’s all roughly the same temperature, which flattens the contrast between your target and the background. Water on the lens scatters the signal too. So your detection range drops in the wet even though the scope is bone-dry inside and working exactly as designed.

Keep the two ideas separate:

• Weatherproofing (IP rating): can water get inside and damage the electronics? No, within the rating.
• Thermal performance in weather: how far and how clearly can it see through rain or fog? Reduced, and no scope escapes that. If you want the full picture on how the sensor forms an image, see how thermal imaging works.

How do I care for the seals and lens?

A thermal optic stays waterproof because its gaskets, battery door and port covers do their job. Look after them and the rating holds for years.

• Keep seals clean and closed. Grit on a rubber gasket is the enemy — it stops the seal mating properly. Wipe the battery-door and USB seals clean, and make sure covers are fully seated and latched before you head out in the wet.
• Dry it after a wet night. Towel off external water before the optic goes in the case. Don’t seal moisture in.
• Clean the germanium lens gently. The objective has delicate coatings. Blow off grit first, then use a proper lens cloth or pen — never scrub a dry lens and never use household glass cleaner.
• Store dry and cool. A cupboard beats a hot car or a damp shed. A silica sachet in the case helps in humid climates.
• Mind the ports. Charge indoors, then close the USB flap firmly. An open port is an open door for water.

If your optic starts behaving oddly after a soaking — image artefacts, a control that won’t respond — it’s usually not a flooded board. Work through our thermal troubleshooting and firmware guide before assuming water damage. And if you’re still weighing up your first unit, the first thermal buyer’s guide for Australia covers what specs actually matter for our conditions.

Frequently asked questions

Are all thermal scopes waterproof?

No. Most quality thermal optics are water-resistant to a stated IP rating, and cheaper units may carry a lower rating or none at all. Always check the IP figure on the product spec before you buy, and match it to how wet your conditions get.

Can I use my thermal scope in heavy rain?

Yes, if it’s rated for it (IP65 and up handle rain well). The scope will stay dry inside. Just expect reduced detection range in the downpour, and wipe water off the objective lens gently as it beads.

What happens if I drop my thermal scope in water?

If it’s rated IP67, a brief, shallow accidental immersion should survive — retrieve it fast, dry it thoroughly, and check function. If it’s rated for jets only (IP66 or lower), submersion risks getting water past the seals. Never deliberately submerge any thermal optic.

Why does my thermal scope fog on the outside?

Moving a cold optic into warm, humid air causes condensation on the external glass — the same as glasses fogging indoors. It’s not water inside the scope. Let it acclimatise and it clears. Persistent fog inside the lens is rare and worth a warranty enquiry.

Does a higher IP number always mean more waterproof?

Not exactly. The first digit is dust, the second is water, and the water tests differ — immersion (7) and high-pressure jets (6) are separate standards, so they’re not simply ranked. Read both digits and match them to what you’ll actually do.

The honest bottom line

Thermal scopes are built to work in the wet — that’s the whole point of a night-hunting tool in a country with real weather. But “water-resistant to a rating” is not “waterproof forever at any depth.” Read the IP code, respect its limit, keep your seals clean and your lens gently cared for, and dry the optic after a wet outing. Do that and rain, dew, fog and the odd creek splash are simply part of the job.

Every Pixfra optic sold through Pixfra Australia is genuine local stock with full Australian warranty, backed by national service through C.R. Kennedy — serviced here, never sent overseas. If you ever suspect a seal has failed, that’s exactly the kind of thing local service is for. Browse the current riflescope and monocular range, grab a protective case to keep grit off your seals, or compare models to find the rating and spec that suit your conditions.