FLIR Gun: A 2026 Guide to FLIR Spot Thermometers and TG Series
“FLIR gun” is colloquial shorthand for FLIR’s pistol-grip thermal devices, most commonly the TG-series spot thermometers with built-in thermal viewfinders or the entry-level E-series inspector cameras with their pistol-grip form factor. The TG-series is the more common reference because the gun-style ergonomics match an HVAC tech’s or electrician’s mental model of pointing a tool at a spot reading. This guide explains the FLIR gun lineup, what each model does, where the spot-thermometer-with-thermal-viewfinder format genuinely earns its place in a toolkit, and how the format compares to full thermal imaging cameras like the One Pro and C5. Pricing, accuracy specs, and use cases are all summarized for 2026.
What Makes a “FLIR Gun” Different from a Thermal Camera
The TG-series uses a different design philosophy than full thermal imaging cameras. The primary spec is spot temperature accuracy, typically +/-1C or +/-1% of reading on calibrated emissivity surfaces; this is the same spec class as a high-end IR thermometer. The thermal viewfinder is a small thermal image (usually 80×60 to 160×120 resolution) that helps the user aim the spot reading at the right location. Some TG models also save thermal video and stills, but the workflow is centered on the spot reading, not the image.
By contrast, full thermal imaging cameras like the One Pro and E-series treat the thermal image as the primary output. Spot temperature is one feature among many. The image resolution, sensitivity, and documentation features matter more than the spot accuracy. For users whose primary diagnostic need is spot temperatures (checking individual circuit breaker hot spots, measuring HVAC vent output temperatures, troubleshooting refrigerator condenser coils), the FLIR gun format is the better-targeted tool. The parent home inspection tools hub covers thermal imaging in the broader inspector toolkit.
The TG-Series Lineup
FLIR’s TG family includes several models in 2026. The TG165 is the entry model with 80×60 thermal viewfinder, +/-1.5C spot accuracy, and pricing at $250-$350; it is one of the most widely sold thermal-equipped tools in the trade. The TG267 (sometimes referenced as TG297 in current catalogs) adds Bluetooth connectivity for mobile-app integration, FLIR Tools support, and a slightly higher 160×120 thermal viewfinder; pricing runs $400-$500. The TG54 and TG56 are higher-spec spot thermometers with similar thermal viewfinders, dual-laser pointer accuracy, and IGM (Infrared Guided Measurement) refinements; pricing runs $500-$600.
What distinguishes the models within the TG line is mostly thermal viewfinder resolution, spot temperature accuracy specs, and whether Bluetooth/Wi-Fi data offload is included. Battery life is similar across the line (rechargeable lithium-ion, 4-5 hours of continuous use). Build quality is similar; all models use the same general housing tooling with model-specific feature variations.
The TG54/TG56 IGM Approach
The TG54/TG56 introduce IGM, FLIR’s term for using the thermal viewfinder to guide spot temperature measurement to the actual hot spot rather than a nearby cooler area. This is a small but meaningful refinement; without thermal context, a user pointing a basic IR thermometer at a “hot” panel breaker often hits the cooler bus bar adjacent to the actually-overheating connection. With IGM, the thermal image shows where the hot spot is, and the laser pointer indicates exactly where the spot temperature is being read. Sibling resources like thermal inspection cameras as a category cover the broader format space.
Where a FLIR Gun Earns Its Keep
Three professional contexts make the FLIR gun format genuinely valuable. HVAC service work: spot-checking supply and return air temperatures, refrigerant line temperatures, and condenser coil performance with thermal context that confirms the laser is hitting the intended part. Electrical service: scanning panel breakers and bus connections for overheating, with thermal imaging confirming hot spots before the spot reading documents the temperature. Automotive service: checking brake rotor temperatures, exhaust manifold and catalytic converter readings, and engine coolant component temperatures with thermal viewfinder aim assistance.
For homeowner use, the FLIR gun fits a narrower band. If a homeowner has specific spot-temperature questions (which breaker is running hot, what is the supply air temperature off the furnace, does this car’s brake rotor look right after a long descent), the TG-series is well-targeted. If the question is more general thermal scanning (“show me where insulation gaps are in my walls”), the One Pro or C5 is the better tool because the higher-resolution thermal image is the primary output rather than the spot reading.
FLIR Gun vs IR Thermometer
The decision against a basic IR thermometer (Fluke 62 Max, Klein IR07, Etekcity 1080) usually comes down to thermal context. A basic IR thermometer reads spot temperature accurately enough for most service work; it has no thermal viewfinder, so the user aims with a laser dot and trusts that the dot is on the right spot. Pricing is $30-$150 for quality units. The FLIR gun adds the thermal viewfinder for $200-$400 more, which is the cost premium of the thermal context.
For users who frequently misaim because the visible target and the thermal target diverge (a hot circuit breaker connection looks identical to the cool one next to it visually but is obvious in thermal), the FLIR gun pays back the upgrade. For users whose targets are visually distinct from their surroundings, a basic IR thermometer is sufficient. HVAC techs and electricians more often justify the FLIR gun; automotive techs are split based on the targets they typically check.
FLIR Gun vs FLIR One Pro
The choice between a TG-series FLIR gun and a One Pro clip-on for iPhone is less obvious. Both cost in the same ballpark ($400-$500 for One Pro vs $400-$600 for TG267/TG54). Both produce thermal images. The differences are use case. The One Pro produces full thermal images as the primary output; spot temperatures are derived from those images via the FLIR Tools app. The TG267 produces spot temperatures as the primary output with thermal context; the thermal image is auxiliary.
For users whose primary work is spot diagnosis (a service technician), the TG-series form factor is faster: pull the trigger, get a spot temperature with thermal context, write the reading on the work order. For users whose primary work is mapping or scanning (an inspector or homeowner looking for distributed thermal anomalies), the One Pro produces better images and integrates with phone-based reporting. Sibling resources like how FLIR cameras compare across the lineup walk through the broader decision space.
Accuracy and Calibration
FLIR gun spot temperature accuracy is bounded by emissivity. Most TG-series models default to 0.95 emissivity (typical of paint, wood, and finished surfaces). Polished metal at 0.1 emissivity will read dramatically below actual temperature unless the user enters a manual emissivity value or applies black tape to the surface and reads the tape (a common workaround). Distance-to-spot ratio also matters: TG165 at 24:1 means a 24-inch standoff measures a 1-inch spot, and longer distances measure larger areas, averaging in cooler surrounding material.
For accurate readings on shiny surfaces, the field workaround is matte black electrical tape applied to the surface; the tape’s emissivity is consistently around 0.95, so the meter reads the tape temperature accurately, and the tape is in thermal equilibrium with the surface beneath. This is the standard technique for measuring polished metal in HVAC and automotive work. Annual factory calibration is recommended for users whose readings drive paid documentation; FLIR offers calibration service for $150-$300 depending on model.
Pricing in 2026
FLIR gun pricing in 2026 stacks like this. TG165 at $250-$350. TG267 at $400-$500. TG54 at $500-$600. TG56 at $600-$700. The pricing premium between models tracks thermal viewfinder resolution and Bluetooth feature set; spot temperature accuracy is similar across the line. Used market pricing typically runs 30-40% below new for current-generation units in good condition. Verifying calibration history before a used purchase is worthwhile, particularly for units that will be used in service work where readings are documented.
Choosing Between FLIR Gun Models
For most professional service users, the TG267 hits the value sweet spot. The 160×120 thermal viewfinder is sharper than the TG165’s 80×60, the Bluetooth connectivity allows readings to be logged to phone or tablet, and the $400-$500 pricing keeps the total tool budget reasonable. The TG54 and TG56 add IGM dual-laser features and are worth the upgrade when small-target accuracy matters (electrical panel work, automotive precision diagnostics). The TG165 remains the right entry point for users who want thermal-equipped spot capability without the full feature set.
For homeowner use, the TG165 covers occasional spot diagnostic needs at the lowest price point. Stepping up to TG267 or higher is rarely justified for non-professional use unless the homeowner has specific recurring needs (regular HVAC service troubleshooting, ongoing electrical panel monitoring) where the additional features pay back. Sibling resources like how thermal imaging cameras compare across formats rank the field.
References
- Infrared Thermography in Home Inspection — International Association of Certified Home Inspectors
- ASHI Standard of Practice — American Society of Home Inspectors
- International Code Council Resources — International Code Council
Thermal imaging cameras
Infrared cameras reveal hidden moisture, missing insulation, and air leaks. Phone-attachment models are the budget entry point; standalone units have higher resolution.
| Product | Why | Buy |
|---|---|---|
 FLIR ONE Pro (phone) | Plugs into iPhone/Android; inspector favorite. | Amazon — $349.00 |
 Topdon TC001 | High-res phone module at a low price. | Amazon — $199.99 |
 FLIR C5 Compact | Standalone pocket camera with Wi-Fi. | Amazon — $449.00 |