Professional-grade 256×192 thermal camera with IP54 rating for demanding field conditions. Designed for electrical, mechanical and building diagnostic professionals who need reliable imaging in harsh environments. 

The UNI-T UTi256G is a handheld industrial thermal imager built around a 256×192 infrared detector with ≤40 mK thermal sensitivity and a manual focus ring.

The 28° × 20° field of view, 1.91 mrad spatial resolution, and -20°C to 550°C (-4°F to 1022°F) measurement range cover the working envelope of electrical inspection, mechanical condition monitoring, building diagnostics, and solar O&M. IP54 sealing and a 2 m drop rating let the imager work in industrial environments without a separate protective case.

The 3.5″ IPS touch display (640×480) keeps menu navigation, palette selection, and on-screen analysis tools at a fingertip. A 5 MP visible camera supports thermal/visual fusion and picture-in-picture for context. Captured images are saved as radiometric JPEGs; temperature data is embedded in every photo, so emissivity, palette, and analysis points can be edited on the imager itself or in the included free PC and mobile analysis software after the inspection is complete. The 5200 mAh detachable Li-ion (UT-M17) battery pack delivers ≈5 hours (Wi-Fi off) of operation per charge and ships in a 2-pack so a spare can stay on the charger.

Choosing Your Model: G Pro Imager

The UTi256G and UTi384G share the same chassis, detector platform (17 μm pixel pitch, 7.5–14 μm spectral response), 40 mK thermal sensitivity, 30 Hz frame rate, manual focus ring, IPS touch display, 5 MP visible camera, Wi-Fi and Bluetooth, laser pointer, LED work light, IP54/2m sealing, and PC + mobile analysis software. 

• 256×192 IR Detector with ≤40 mK NETD: Resolves subtle temperature gradients that signal early-stage component degradation; -20°C to 550°C (-4°F to 1022°F) measurement range covers electrical, mechanical, and process inspections.
• Manual Focus Ring: Mechanical focus control delivers a sharp thermal image at any working distance — particularly important in cabinet inspections and standoff distances where autofocus systems hunt.
• 3.5″ IPS Touch Display (640×480): Direct on-screen analyzer placement, palette selection, and isotherm tuning without menu navigation.
• On-Screen Analyzer — 3 points / 3 lines / 3 rectangles / 3 circles: Build the analysis grid the job needs without exporting to a PC.
• Hi/Lo Auto-Tracking + Icon Alarm: Auto-tracking marks the hottest and coldest points in the scene in real time; configurable Hi/Lo alarms trigger an on-screen icon when thresholds are crossed.
• Radiometric Image Storage: Every saved JPEG embeds the underlying temperature data — emissivity, palette, isotherm, and analysis points can be re-applied after the fact, in-camera or in the included PC software.
• Wi-Fi + Bluetooth + Free Mobile App: Wi-Fi photo download, real-time video streaming to the mobile app, and Bluetooth voice annotation pairing — no subscription, no per-device license.
• Laser Pointer + LED Work Light: Laser pointer for target identification on the visible camera reference; LED light extends the imager into low-light cabinets and crawlspaces.
• Field-Swappable 5200 mAh Li-ion Battery (UT-M17): Ships in a 2-pack; ≈5 hours (Wi-Fi off) per charge keeps a full inspection day on one set.
• IP54 Sealed, 2 m Drop Rated: Industrial enclosure runs without a protective sleeve in dusty, damp, or impact-prone work areas.

UTi256G Detailed Features

≤40 mK NETD with Manual Focus Ring

The 256×192 detector reaches a noise-equivalent temperature difference of ≤40 mK, the level at which thermal patterns from a single overloaded conductor or a stuck bearing lift cleanly out of the background. The combination matters: high IFOV doesn't help if focus is fighting the operator, and a sharp image without sensitivity leaves the inspector guessing at borderline anomalies.

The manual focus ring sits on the lens barrel and turns with light pressure. Crews working through cabinet doors, at the top of a ladder, or with gloves get focus where they want it without an autofocus system hunting between the door frame and the busbar behind it. For repeating inspection routes, focus position can be set and left alone.

3.5″ IPS Touch Display

The 640×480 IPS panel renders thermal scenes with the contrast and viewing-angle tolerance needed in industrial spaces — overhead lighting glare, side viewing from a ladder, or under direct sun outdoors. Touch input lets the inspector drop analyzer points and rectangles where the eye sees them, instead of nudging a cursor with the directional pad.

Palette selection, isotherm mode, image-mode switching (Thermal / Visual / Fusion / PIP), and level-and-span adjustment are one-tap operations. The on-screen layout remains readable in landscape grip during long inspection walks.

Laser Pointer and LED Work Light

A center-aligned laser pointer marks the visible-camera centerline at the target — useful when calling out hot spots to a partner on the ground, or when documenting which breaker in a panel array is the one heating up. The integrated LED work light extends the imager into dark cabinets, basement utility rooms, and post-incident inspections where general lighting is offline.

Both controls live on the top-deck buttons within thumb reach of the trigger hand. The laser is independent of the trigger so it can be used for pointing without capturing an image.

Wi-Fi, Bluetooth, and Free Mobile App

Wi-Fi transfers radiometric JPEGs directly to a phone or tablet for tagging in the field — without USB cables or removing the microSD card. The same Wi-Fi link supports live video streaming to the mobile app, which a second person can monitor on a tablet while the lead inspector positions the camera. Bluetooth handles voice annotation pairing with the mobile app.

The mobile app and the PC analysis software are free, with no subscription, no per-seat license, and no expiring trial. Both deliver radiometric re-analysis — emissivity correction, palette change, isotherm tuning, multi-point analysis, and inspection-report export.

Hi/Lo Tracking with Icon Alarm

Auto-tracking continuously locates the hottest and coldest pixels in the live thermal scene and marks them on screen — so the inspector sees the worst case before deciding where to place fixed analyzer points. Threshold-based Hi/Lo alarm modes trigger an animated on-screen icon when the tracked max or min crosses a configured value, useful on long inspection walks where the operator may not be looking at the screen every second.

Five isotherm modes — Auto, Manual, Above, Below, and Section — highlight pixels in a chosen temperature band with a contrasting color, making it easy to spot borderline cases (a connection that's warm but not yet alarming) in a busy thermal image.

5 MP Visible Camera with Thermal Fusion

The 5 MP visible-light camera captures a high-resolution visual reference alongside every thermal frame, so equipment, nameplates, and surrounding context appear in the inspection record. Picture-in-picture overlays the thermal image inside the visual frame; fusion mode blends thermal data onto edges detected in the visual image to make specific components — connectors, breakers, motor housings — easier to identify in reports later.

Radiometric JPEG — Post-Shoot Emissivity Correction

The thermal imager saves every photo as a radiometric JPEG: the visible image is rendered for review, but the underlying calibrated temperature data is embedded in the same file. The result is that emissivity assumptions don't have to be locked in at capture time. Inspectors who later learn a measured surface was bare metal rather than painted (or vice versa) can re-apply the correct emissivity to images already on file and recover accurate temperatures.

The in-camera image editor (Settings → Picture) supports emissivity adjustment, palette change, analyzer-object editing, and isotherm reconfiguration directly on saved photos. The same operations are available in the PC and mobile software, with export to inspection-report templates.

Detachable Li-Ion Battery Pack

The 5200 mAh Li-ion battery pack (UT-M17) is field-swappable in seconds and ships in a 2-pack so a spare can stay on the charger during inspection rotations. ≈5 hours (Wi-Fi off) of continuous operation per charge covers a full inspection day; the spare extends runtime without an AC connection. The replacement battery (UT-M17) is a separate orderable SKU for keeping additional spares on-truck or in the shop.

IP54 Rated, 2 m Drop Protected

The IP54 enclosure protects against dust ingress and water spray from any direction — the operating environment for plant-floor electrical inspection, outdoor PV string walkdowns, and HVAC mechanical-room work. The 2 m (6.6 ft) drop rating means a slip from a ladder rung or a benchtop doesn't end the inspection day. The imager runs without a separate protective sleeve, so controls and the focus ring stay accessible.

Applications

Electrical Inspection — Switchgear, Panels, and Connection Points

Electrical maintenance teams use the imager to walk distribution panels, MCC lineups, and switchgear lineups, identifying loose or corroded connections by their thermal signature before they fail. The radiometric image storage means a borderline connection that read 38°C against a 25°C ambient at first inspection can be re-analyzed months later against fresh ambient data to confirm whether the situation is degrading. Hi/Lo tracking surfaces the worst point in a busy panel without manual analyzer setup, speeding routine walkdowns.

Mechanical and Rotating Equipment Condition Monitoring

Motor housings, bearing pillow blocks, gearbox cases, pump seals, and conveyor drive rollers all telegraph developing failures through temperature change before audible or vibratory symptoms appear. The 40 mK sensitivity surfaces the 3-5°C rise that distinguishes an alignment issue from normal operating temperature, and the manual focus ring lets crews work at the safe standoff distance from running equipment.

Building Diagnostics — Insulation, Moisture, and HVAC

Building inspectors and HVAC technicians use the imager to map insulation gaps in walls and ceilings, locate moisture intrusion behind finishes, and verify proper hot- and cold-air distribution from supply diffusers. The 3.5″ touch display makes it practical to drop analyzer rectangles on suspect areas in the field. Radiometric storage allows return visits to compare against baseline images.

Solar PV Operations and Maintenance

Solar O&M crews scan string inverters, combiner boxes, and module strings for cell- level hot spots indicating bypass diode failures, shading damage, or solder-joint degradation. The Wi-Fi link supports tagging anomalies to a phone-based site map in real time. The IP54 rating and 2 m drop tolerance suit rooftop and ground-mount environments where the imager is regularly handed up to mounted work or set down on rough surfaces.

Accessories and What's in the Box

In the Box

• UTi256G thermal imager
• 5200 mAh Li-ion battery pack — UT-M17 (×2)
• Type-C USB cable
• microSD card
• Hand strap
• User documentation and download guide card
• Toolbox and gift box

Available Separately

• UT-M17 — Replacement 5200 mAh Li-ion battery pack (when an additional spare beyond the 2 included is needed)

Specifications

FAQ's

Is the saved image radiometric, or just a thermal picture?

Radiometric. Every photo the UTi256G saves is a JPEG that embeds the underlying temperature data — emissivity, palette, isotherm, and analyzer points can be edited after the fact, either in the camera (Settings → Picture editor) or in the included PC and mobile software. This means an inspection done with the wrong emissivity setting can be recovered without revisiting the site.

How does the UTi256G / UTi384G compare to UNI-T's other thermal imagers?

The G Pro Imager sits in UNI-T's industrial mid-tier: 40 mK sensitivity, manual focus ring, touch display, Wi-Fi/Bluetooth, and radiometric image storage. Step up to the UTi384J or UTi640J for continuous autofocus and an interchangeable lens system. Step up further to the UTi740X, UTi740XH, UTi760X, or UTi760XH for laser-assisted autofocus, AI voice commands, and a six-lens system including the high-temperature lens for measurements to 2200°C.

How long does one battery charge last in the UTi256G?

Approximately five hours of continuous operation with Wi-Fi off — a full inspection day in most workflows. The imager ships with two batteries so a spare can stay on the charger; a third (UT-M17) can be ordered separately.

Downloads

UNI-T 256G Thermal Imager Datasheet

UNI-T 256G Thermal Imager Users Manual