The UNI-T Inspector Series brings the imaging capability of a thermography lab into a single 5-inch handheld instrument.

A 400×300 radiometric detector at 1.28mrad IFOV resolves temperature variation across switchgear panels, motor housings, transformer oil-fill levels and PCB hotspots without the cooled-detector cost or the workflow overhead of a dedicated thermography rig. Super-resolution synthesizes a 800×600 output from the native detector — useful when the source image needs to read clearly in a report figure or annotation panel.

Continuous autofocus, contrast / semi-auto AF, and laser-assisted focus combine to keep the target in focus across the working range — useful when moving down a substation aisle inspecting bus connections, or stepping in and out of an MCC panel. The Inspector Series accepts six interchangeable lenses covering field-of-view from 7° tele to 46° wide, with a High-Temperature lens that extends measurement to 1000°C – 2200°C for foundry, refractory, kiln, and induction-heating work.

A 16-point analyzer with T-select, ROI emissivity correction, Smart Meter (auto-recognition of gauges and meters in the visual channel), AI Voice annotation, dual-channel imaging, and OTA firmware updates round out the Inspector Series feature set. The instrument ships with PC + mobile analysis software included — no subscription, no per-seat license. Field workflow connects via Wi-Fi live streaming, Bluetooth, HDMI display extension and Type-C USB.

This is the XH configuration. The UTi740XH ships with the High-Temperature lens included and supports the full lens lineup — standard-family lenses can be added as accessories. See Lens Configuration below.

• 6-lens interchangeable system covering 7° tele to 46° wide, including a High-Temperature lens for 1000°C – 2200°C measurement (configuration dependent — see Lens Configuration below)
• 5-mode focus system — Continuous AF, Semi-Auto / Contrast AF, Laser-Assisted Focus, Touch AF, Manual
• ≤35mK NETD thermal sensitivity at 30Hz frame rate
• 5″ IPS touch display (1280×720) with HDMI output for extended display
• 16-point analyzer with T-select for targeted region temperature recall
• ROI emissivity correction (per-region emissivity for mixed-material targets)
• AI Voice commands + voice annotation; Smart Meter for gauge auto-reading in the visual channel
• Wi-Fi live streaming, Bluetooth, Type-C USB, Micro HDMI
• Type-C direct charging or independent battery charging (90% in 2.5 hours)
• PC + APP analysis software included; OTA firmware upgrade supported
• IP54 + 2m drop rating; -20°C to 55°C operating range

Detailed Features

6-Lens System

The Inspector Series accepts six interchangeable lenses: Standard, Wide-angle, Tele, Ultra-Tele, High-Temperature, and Macro. Each lens has its own focal length, aperture, FOV, IFOV, and minimum imaging distance. Lens recognition is automatic — the imager detects the installed lens by ID and applies the correct calibration table without operator input. Wide-angle (46°×34°) for room-scale inspection. Tele (14.6°×10.9°) and Ultra-Tele (7.2°×5.5°) for transmission-line and overhead-substation work where access is restricted. Macro (24~42mm minimum imaging distance) for PCB component-level analysis.

5-Mode Focus System

Continuous AF keeps the target in focus as you move toward or away from it — useful when sweeping a row of panels or working down a conveyor line. Semi-Auto Focus (760X / 760XH) or Contrast AF (740X / 740XH) gives a single confirmation press to lock focus on the framed target. Laser-Assisted Focus uses the integrated rangefinder to compute distance and drive the focus motor — fast and accurate for hard-to-focus low-contrast targets. Touch AF lets you tap any point in the live image to focus there. Manual focus is available for thermographers who prefer it for specific workflows (e.g., consistent through-glass measurement). Focusing time is under 2 seconds across all modes.

High-Accuracy Temperature Measurement

Standard-lens accuracy is ±1.0°C / ±1.0% in the 0°C – 120°C range, ±1.5°C / ±1.5% in the 20°C – 600°C range, and ±1.5% in the 500°C – 1200°C range (whichever is greater, at 25°C ambient). With the High-Temperature lens, accuracy is ±1.5% across 1000°C – 2200°C. ROI emissivity correction lets you assign per-region emissivity for mixed-material targets — necessary when a single frame contains rough metal, painted metal, and unpainted insulator surfaces, each of which has a different effective emissivity.

Level & Span Control

Auto, Manual, and Touch level/span modes are selectable in the live image. Auto adjusts to the scene continuously; Manual lets you lock the temperature range to a fixed window for consistent frame-to-frame comparison (essential for documentation series); Touch lets you tap the screen to set the level/span to the temperature at the touch point. The 16-point analyzer with T-select supports point, line, rectangle, and circle ROIs — up to 16 of each — with the T-select function letting you recall any saved ROI's temperature data as the active reading.

AI Voice + Smart Meter + Voice Annotation

AI Voice accepts spoken commands for capture, mode switching, palette change, and analyzer placement — useful when the imager is mounted on a tripod or held at arm's length where touch operation is impractical. Smart Meter scans the visual channel and automatically extracts readings from analog gauges, digital meters, and dial indicators, embedding the recognized value as metadata on the thermal image. Voice Annotation records audio notes attached to each frame — saved alongside the radiometric JPG, available in the analysis software and exported reports.

Imaging Modes — T-Mix, Dual-Channel, Fusion, PIP

T-Mix is UNI-T's blended overlay mode that lays the thermal layer over the visual layer with adjustable transparency — clearer than traditional Fusion for low-contrast targets where the visible-light context anchors interpretation. Dual-channel imaging records the thermal and visual streams simultaneously as separate radiometric video files, letting downstream analysis compare frame-by-frame. PIP places a thermal inset over a visual base image (or vice versa). Standard Fusion remains available for users who prefer it.

Connectivity + Storage

Wi-Fi live streaming pushes the active image to a paired phone or laptop, supporting remote viewing and remote capture. Bluetooth pairs with the UNI-T Thermal mobile app for field analysis and report generation. HDMI display extension drives a monitor for training, presentation, or supervisory review (Micro HDMI at the instrument; standard HDMI at the display). Built-in 128GB storage plus SD expansion handles long inspection sessions. Image format is radiometric JPG (each saved image carries the full temperature matrix, recoverable in PC analysis software). Video format is MP4 plus UIR (UNI-T's radiometric video container).

Battery + Charging

The UT-M25 battery pack is a 7.2V / 5000mAh detachable Li-ion unit, providing ≥5 hours continuous operation. Charging is by Type-C direct (with the battery in the instrument) or by independent charger (battery removed). Either method recovers to 90% in 2.5 hours, supporting hot-swap workflows on extended inspections.

OTA Firmware Upgrade + PC/APP Software

Firmware updates download over Wi-Fi when available. New features added post-purchase (new palettes, new analyzer modes, new AI Voice commands, refinements to emissivity tables) deploy without service-center intervention. PC analysis software and mobile APP are included — no subscription, no per-seat license, no time-limited evaluation. Both support radiometric image analysis, report generation, and project organization.

Choosing Your Model: Inspector Series

The Inspector Series spans four factory-build configurations across two IR resolutions. The 740 platform delivers 400×300 detector resolution; the 760 platform delivers 640×512. Each platform ships in an X configuration (conventional lens, -20°C to 1200°C native range, calibrated for the standard lens family), and an XH configuration (high-temperature lens factory-included, 1000°C to 2200°C native range, factory-calibrated for the full lens lineup including standard-family lenses as accessories). Sampling rate, NETD, 5″ touch display, AI voice commands, 5-mode autofocus and the rest of the platform are identical across all four models.

Applications

Substation + Power Tower Inspection

Long-distance bus connection and transmission-line hotspot survey. Tele and Ultra-Tele lenses extend safe working distance; LRF + laser-assisted focus delivers clear imaging at 50m. Radiometric JPG output supports compliance reporting and trend tracking across periodic inspections.

Electrical Equipment + Switchgear

MCC connections, breakers, contactor stacks, and bus-tie joints. The 400×300 detector resolves individual phase imbalance and developing high-resistance connections at panel-distance working ranges. The 16-point analyzer with T-select supports inspection-checklist workflows — preset ROIs recalled per asset record.

PCB R&D + Component-Level Thermography

The Macro lens supports component-level analysis with a minimum imaging distance in the 20~42mm range (configuration dependent). ROI emissivity correction handles the mixed-material reality of populated PCBs — solder mask, copper pour, ceramic-package ICs, and plated through-holes each carry different effective emissivities. T-Mix overlay preserves the visible-channel reference markings during analysis.

Foundry / Refractory / Induction Heating

The factory-calibrated High-Temperature lens extends measurement to 1000°C – 2200°C. Use cases include refractory wall hot-face monitoring, induction-heater coil-and-billet inspection, kiln shell temperature mapping, ladle pre-heat verification, and steel-mill rolling-mill bearing surveillance. Add a standard-family lens (sold separately) for general-purpose electrical and mechanical inspection on the same body.

Accessories

In the Box

• UTi740XH thermal imager body
• UT-Z052 High-Temperature (18mm, F1.0, 14.6°×10.9° FOV)
• UT-M25 Detachable Li-ion battery (7.2V / 5000mAh)
• Type-C USB cable
• Battery charger
• Carrying case
• Quick Start Guide

Compatible Lens System

The lens lineup compatible with this body:

• UT-Z048 Standard Lens (9.6mm, F1.0, 27.7°×20.6° FOV) — sold separately
• UT-Z049 Wide-angle Lens (6mm, F1.0, 46°×34° FOV)
• UT-Z050 Tele Lens (18mm, F1.0, 14.6°×10.9° FOV)
• UT-Z051 Ultra-Tele Lens (36mm, F1.3, 7.2°×5.5° FOV)
• UT-Z052 High-Temperature Lens (18mm, F1.0, 14.6°×10.9° FOV; 1000°C – 2200°C) — included, factory-calibrated for this body. Special-order item; contact UNI-T for replacement.
• UT-Z053 Macro Lens (18mm, F1.1, 24~42mm imaging distance)

Recommended

• Spare UT-M25 Battery Pack (extended-session work)
• UNI-T PC Analysis Software (included; download from product page)

Specifications

Downloads

UNI-T 740XH Thermal Imager Datasheet

UNI-T 740XH Thermal Imager Users Manual