The Short Answer

Choose FLIR when the brand itself is a requirement: the specification names it, the plant already runs its reporting software, the service contract is written around it, or the person signing the purchase order needs the name on the instrument. Choose Guide IR when the requirement is written as performance — resolution, NETD, temperature range, accuracy, sealing, reporting — and the budget has to be defended. In that second case you are buying an instrument class, not a logo, and the class is defined by numbers you can verify on a datasheet.

Two rules decide most of these evaluations. First, compare like with like: a 256×192 handheld and a 640×512 handheld are not alternatives, whatever the price difference says. Second, decide the reporting workflow before the hardware, because the software, the file format and the calibration paperwork are what turn a measurement into evidence your client will accept. Get those two right and the brand question usually answers itself.

Why This Comparison Keeps Coming Up

In an established utility, the thermal camera rarely arrives as a clean purchase decision. It arrives as a replacement. Somebody bought an instrument years ago, the inspection report template was built around it, the maintenance procedure quotes its resolution, and the next budget cycle has to justify either the same thing again or something different. That is where the comparison is born — not on a specification sheet, but in a procurement file that already contains a brand name.

Add a second pressure. Thermal imaging has moved down the price curve. A 320×240-class detector that cost a great deal fifteen years ago is now a mid-range component, and a 384×288 handheld with 15 mK sensitivity is a normal working instrument rather than a laboratory item. More suppliers can build a competent camera around the same physics, and more buyers can therefore ask a legitimate question: what am I paying for when I pay for the reference brand?

The honest answer is: several real things, and possibly a premium you do not need. The rest of this page separates them.

Two Different Ways of Getting a Camera

FLIR, today part of Teledyne Technologies, is the brand that most buyers in Africa, Latin America and the Middle East already know. Its advantages are the ones that come with scale and history: a very wide catalogue that spans entry handhelds to fixed-mount monitoring cameras, a large accessory system, a reporting software platform that many inspection organisations standardised on years ago, and a sales and service presence in a long list of countries. Those are not marketing claims; they are the practical reasons a specification often names the brand.

Guide IR is the commercial thermal imaging brand of Guide Sensmart / Wuhan Guide Infrared, a Chinese infrared manufacturer. The relevant structural fact is that the company develops and produces its own uncooled detector cores rather than buying them in, which is why its instruments can be positioned differently on price while still carrying professional-class specifications. On this site you will see the same instruments badged in two ways: original Guide IR branding, or neutral packaging for distributors who sell under their own name. Availability of the neutral option is confirmed per model, quantity and destination rather than assumed.

Unitech Tools sits between the factory and the buyer. We are the industrial inspection equipment business of UNITECH GLOBAL LIMITED, a Hong Kong registered company, and we supply selected instruments from several manufacturers — which is exactly why we can write a comparison like this. When a Guide IR instrument fits, we will say so; when the application genuinely calls for something we do not supply, the correct answer is that we are the wrong supplier for it.

The Seven Decisions That Actually Matter

Brand loyalty is not a criterion. These seven are, in roughly this order.

1. Detector resolution against the target size

Resolution decides whether a hot connection in the back of a panel is a measurable spot or a single pixel. The practical floor for electrical inspection is a 320×240-class detector; 384×288 is the comfortable working standard, and 640×512 is what you specify when the target is small, the distance is long or the report has to survive scrutiny. Pair the resolution with the field of view: a wide-angle lens on a low-resolution detector wastes pixels on the surroundings, and a narrow lens on the same detector makes every survey a walking exercise.

2. Thermal sensitivity (NETD)

NETD is the smallest temperature difference the camera can resolve, and it is the specification that decides whether a warm termination appears against a warm background. For electrical work, 40 mK is acceptable, 20 mK is good, and 15 mK is where a handheld starts to show early-stage faults rather than only the obvious ones. A camera with excellent resolution and poor NETD produces a detailed picture of nothing much.

3. Measurement range and accuracy

Most electrical inspection happens between −20 °C and +150 °C, and almost none of it needs more, until it does: busbar and cable work in a foundry, refractory, molten metal handling or a fire investigation can push an instrument far beyond that. Confirm two numbers, not one — the range and the accuracy statement (±2 °C or 2 % of reading is the common professional claim). Also confirm what happens at the edge of the range: a camera that saturates has stopped measuring.

4. Focus, optics and ergonomics

Manual focus is not a luxury on an inspection camera; a soft image is an unmeasurable image, and autofocus on a temperature-varying target can hunt exactly when you need a stable reading. Check the focus mechanism, the lens options, the weight in the hand and the display in daylight. An instrument that is awkward to hold gets used once and then lives in the case.

5. Reporting software and file formats

Ask what the camera records (radiometric JPEG or vendor format), what desktop software opens it, whether the software is licensed per seat, and whether the report can be produced without the vendor's cloud. If your client requires a signed PDF with a per-point temperature table, that workflow has to exist before you buy. This is the single criterion most often skipped in a price-led purchase, and the most expensive to discover late.

6. Calibration, service and spares

An instrument used for measurements belongs on a calibration interval. Ask three questions: what document is issued, where the calibration can be performed in your region, and what a repair or detector replacement would involve in practice. A premium brand with a local service centre can be cheaper over ten years than a lower-priced instrument that has to be shipped back across a border.

7. Delivery, documentation and commercial terms

Lead time, Incoterm, warranty wording, certificate scope, manual language, packaging and whether the supplier will write the offer against your specification — these are commercial criteria, and they decide whether the instrument arrives in time for the inspection season. They also decide what happens when something goes wrong. Certificates, warranty terms and lead times are confirmed per model and per quotation, never assumed from a datasheet.

Buying rule: compare the specification, then the price, then the support — in that order. Comparing price first produces a purchase you can defend for one meeting and regret for five years.

Mapping Specification Tiers to Models

The table below is the framework we use in a first conversation. The left column is the requirement; the right column names an instrument from this lineup that meets it, with figures taken from the datasheet published on this site. FLIR's catalogue covers the same tiers, which is precisely why the comparison should be made tier by tier rather than brand by brand.

Requirement	What it means on site	Minimum specification	Model in this lineup
Entry electrical survey	Panels, distribution boards, motors, quick walk-downs	256×192, NETD ≤50 mK, manual or auto focus	Guide E3S (EasIR), MobIR 2S
Professional inspection	Cable terminations, busbar, MCC, transformers, reports	384×288, NETD ≤20 mK, manual focus, ±2 °C accuracy	EasIR Series, Hammer II
High-resolution diagnosis	Small targets at distance, detailed documentation	640×512 or better, NETD <20 mK	PT650, Hammer II Pro
Wide-range industrial	Foundry, refractory, molten material, fire investigation	Range to +1500 °C or beyond, high-temperature option	PT450, PT II Series
Thermal plus partial discharge	Switchgear and cable PD screening in one instrument	Thermal channel plus PD detection channel	SC Series
Fixed 24/7 monitoring	Substation, remote plant, solar field, unattended asset	Online camera, IP66, 4G transmission, solar supply	WY30 Series, WY20 Series

Two notes on reading it. A tier is a class, not a model: within the professional tier, a 384×288 instrument and a 640×512 instrument both qualify, and the choice between them is about target size and report requirements, not about quality. And the last row is where many utilities now spend their incremental budget: a fixed camera watching the assets that fail slowly is often worth more than one better handheld.

The Guide IR Instruments We Supply

Every figure below is taken from the model page published on this site. We publish the classes because the comparison is only meaningful if it is made at the same level.

Model	IR resolution	NETD	Temperature range	Frame rate	Focus	Protection / weight
Guide E3S (EasIR)	256×192 @12 µm	≤15 mK @25 °C	−20 to +550 °C	30 Hz / 9 Hz	Manual / auto	IP54, 2 m drop, ~0.6 kg
EasIR (E4S class)	384×288 @12 µm	≤15 mK @25 °C	−20 to +650 °C	30 Hz / 9 Hz	Manual / auto	IP54, 2 m drop, ~0.6 kg
Hammer II	384×288 / 640×512 (Pro)	≤40 mK @30 °C	−20 to +650 °C, option to +2000 °C	30 Hz	Manual / auto / electric	IP54, 1.48 kg, laser 40 m
Guide PT450	480×360	≤20 mK	−40 to +2500 °C	30 Hz	Manual / auto, TwinView DFOV	Laser ranging, fast charge
Guide PT650	640×512	≤20 mK	−40 to +2500 °C	30 Hz	Manual / auto, TwinView DFOV	Laser ranging, fast charge
PT II Series (top of range)	up to 1280×1024	<20 mK @30 °C	−20 to +650 °C, option to +2500 °C	50 Hz	Manual / auto, TwinView DFOV	IP54, 5.5 in touchscreen, ±2 °C or 2 %
Guide MobIR 2S / 2T	256×192 (25° / 56° FOV)	≤50 mK	−20 to +550 °C	smartphone host	Autofocus	USB-C / Lightning, no battery
WY30 Series (online)	384×288 / 640×512	—	−20 to +150 / 0 to +410 °C, option to +2000 °C	—	Electric focus	IP66, solar + 4G
WY20 Series (online)	160×120 / 256×192	≤50 mK @25 °C	−20 to +150 / 0 to +650 °C	—	Fixed	IP66, solar, ≥15 days standby

For a model-by-model view of how the tiers differ inside the range, two of our comparison pages go deeper: Guide E3 vs E3S for the entry tier, and Guide PT450 vs PT650 for the professional tier. If the decision is between a thermal camera and an acoustic camera for a partial discharge programme, thermal vs acoustic for PD detection is the page to read next — they answer different questions and are usually complementary rather than alternative.

When the Premium Brand Is the Right Answer

We will lose some of these arguments, and we would rather say so up front. Specify the reference brand when any of the following is true.

• The specification names it. A tender or an internal standard that quotes a brand or model leaves no room, and offering something else wastes everyone's time.
• The reporting platform is already standardised. If every inspector, every report and every archive in the organisation runs on one software platform, migrating that workflow costs more than the hardware difference.
• Local service is contractual. Where a service-level agreement, a calibration laboratory or a spare-parts channel exists in-country for one brand and not the other, that availability is worth real money over the life of the instrument.
• The buyer is not the user. When the instrument has to be defended to a board, a donor or a public auditor, a familiar brand shortens the conversation.
• The application is unusual. Very high frame rate, cooled detectors, specialised optics or research-grade radiometry are areas where the wider catalogue of a large manufacturer genuinely wins.

When a Guide IR Instrument Is the Right Answer

The reverse case is just as concrete. A Guide IR instrument is normally the better commercial decision when:

• The requirement is performance-based. If the specification asks for 384×288 or better, NETD at or below 20 mK, ±2 °C accuracy and a documented report, an instrument that meets it is a compliant offer regardless of the badge.
• Fleet scale matters. A utility buying fifteen or twenty instruments is not buying one camera; it is buying a fleet, and at fleet scale the price tier difference funds training, calibration cycles and spares that would otherwise be cut.
• You need high-temperature range without a second instrument. The PT450 and PT650 cover −40 °C to +2500 °C, which removes the need to buy a separate high-temperature camera for foundry, refractory or fire-investigation work.
• You distribute. Neutral packaging and OEM branding are available on selected models, confirmed by model, quantity and destination. For a distributor building its own brand, that flexibility is often the deciding factor.
• You want thermal and partial discharge in one housing. The SC Series combines a thermal channel with partial discharge detection, which changes the shape of a substation inspection round.
• Documentation and delivery are the real constraint. A supplier who will write the offer against your specification, confirm certificate scope for the exact model and coordinate DHL or freight delivery to your country is often what makes a project happen on time.

How to Compare Two Cameras Fairly

Five tests, in this order, will separate two offers faster than any datasheet discussion.

1. Same-target, same-distance image test. Point both instruments at the same warm object at the same distance with the same lens class. If the supplier will not arrange a demonstration, treat the specification as unverified.
2. Focus test on a small target. Ask for a small target — a terminal block, a bolt head — at working distance. This is where resolution and optics earn their price.
3. Low-contrast test. Find a surface only a few degrees above ambient. The camera that resolves it has the better NETD, and that is the camera that finds early-stage faults.
4. Report test. Ask for a sample report generated from the camera's own file, including a temperature table and the metadata. Then read it as if you were the client.
5. Paperwork test. Ask for the datasheet of the exact quoted variant, the applicable test report, the certificate scope, the calibration document and the manual in your language. Every item is either available or it is a warning.

A demonstration on your own equipment, in your own switchgear room, beats every specification conversation. Ask for it before you ask for a discount.

The Cost That Is Not on the Quotation

Purchase price is the smallest part of the ten-year cost of a thermal camera, and the part that is easiest to compare. The rest is less visible and usually decides which instrument was the better buy.

• Annual calibration. Multiply the cost and the transit time by the number of instruments and by the number of years. If calibration means exporting the instrument, add the downtime.
• Batteries and chargers. Field-replaceable batteries are a consumable; an instrument with an unusual cell or a captive battery generates years of friction.
• Software and seats. Confirm whether the reporting software is included, licensed per seat or per year, and whether reports can be produced without a cloud subscription.
• Training. A camera in the hands of an untrained operator produces confident mistakes. Budget for a day of application training across the fleet; the cost is small next to a missed fault.
• Retirement risk. Instruments that are hard to repair, or whose batteries and accessories disappear from the market, get retired early and quietly.

What to Send for a Quotation

Send these nine items and the first quotation you receive will be comparable with the second. Anything shorter produces offers you cannot place side by side.

1. The application: substation, distribution network, industrial plant, building envelope, solar or fire service.
2. The target and the working distance — the two facts that set the resolution and the lens.
3. The specification you are buying against, including any tender text or internal standard.
4. Resolution, NETD, temperature range, accuracy and frame rate, if your specification already fixes them.
5. The reporting requirement: file format, software, number of seats, report language.
6. Accessories: lenses, batteries, chargers, cases, tripods, software licences, spare parts.
7. Quantity, delivery country, local voltage and the language required for the manual and the interface.
8. Documentation and packaging: test report, certificate scope, calibration document, neutral or branded packaging, Incoterm.
9. Warranty and after-sales expectations, so they can be priced inside the same offer rather than added later.

Our international order and procurement support page describes the same process from the supply side: model, configuration, accessories, quantity, validity, lead time and Incoterm written into one document, with certificate scope and warranty confirmed for the exact model being quoted.

Frequently Asked Questions

Is Guide IR a copy of FLIR?

No. Guide IR is the commercial thermal imaging brand of Guide Sensmart / Wuhan Guide Infrared, a Chinese infrared company that develops and manufactures its own uncooled detector cores. FLIR, now part of Teledyne Technologies, is a separate and much older business with its own detector technology, product families and software platform. The two brands compete in the same application space — handheld and fixed thermal imaging for electrical, industrial and building inspection — not because one copies the other, but because both build cameras around long-wave infrared detectors and the same physics.

Is Guide IR cheaper than FLIR?

In most markets a Guide IR instrument is offered at a lower price than a comparable-class FLIR model, and that difference is usually the reason the comparison is made at all. The gap is real but it is not a fixed percentage: it moves with the model, the quantity, the accessories, the currency of the offer, the Incoterm and the after-sales package. Ask for both offers written against the same specification — the same resolution, NETD, temperature range, accuracy, accessories and documentation — before you compare the numbers. Price is confirmed per model, per configuration and per quotation.

Which brand is better for electrical inspection?

Neither brand is better in the abstract; the instrument class decides the outcome. For distribution panels, motor control centres, cable terminations and switchgear exteriors you need a handheld with at least 320×240-class resolution, NETD at or below 40 mK, manual focus, an emissivity setting and documented accuracy, plus a reporting workflow. Both brands offer that class. The practical difference shows up in price, in software, in calibration and service logistics, and in how quickly the instrument can be delivered to your country.

Can a Guide IR camera use FLIR software?

Do not plan on it. Each brand's reporting suite is built for its own file format and metadata, and cross-brand import is not something a supplier should promise. If your inspection programme already runs on a specific reporting platform, treat that as a hard requirement in the inquiry and ask the supplier to confirm in writing which software the quoted model ships with and which export formats it produces.

What is the difference between the Guide E series and the Guide PT series?

The E series (EasIR / E3S / E4S class) is a tool-like handheld built for everyday electrical and building survey work: 256×192 or 384×288 resolution, 15 mK-class NETD, a 3.5-inch display and more than twelve hours of runtime. The PT series (PT450, PT650 and the wider PT II family) is a higher-tier inspection instrument: 480×360 up to 1280×1024 resolution, NETD below 20 mK, a 5.5-inch touchscreen, TwinView dual field of view and a measurement range that extends to +2500 °C on the high-temperature variants. The E series answers "what is hot"; the PT series answers "how hot, exactly, and where".

Do I need a premium brand to bid on a tender?

It depends on how the specification is written. If the tender names a model or a brand, you have no choice. If it states performance — resolution, NETD, temperature range, accuracy, frame rate, sealing, reporting — then any instrument that demonstrably meets those numbers is a valid offer, and the evaluation should be made on the technical response and the price. Send us the specification text and we will tell you plainly whether our selected models meet it, and where they do not.

The Bottom Line

Guide IR vs FLIR is not a contest between a good camera and a bad one. It is a choice between two supply models: one sells a brand with a long service history, a very wide catalogue and a software ecosystem many organisations already run on; the other sells a vertically integrated Chinese manufacturing platform at a different price tier, with professional-class specifications and the flexibility of neutral or OEM branding. Decide the instrument class first — resolution, NETD, range, accuracy, focus, reporting — then compare the offers written against that class, then weigh the support and the paperwork, which is where the real money lives over ten years. If the specification names a brand, buy the brand. If it names performance, buy the instrument that meets it and can prove it.