| Native Image Resolution | 1,920 × 1,080 pixels; approximately 2.07 million pixels per frame. | 3,840 × 2,160 pixels; approximately 8.29 million pixels per frame. | 4K provides four times as many pixels as 1080p, which can help reveal small cracks, joints, roots, and surface defects when the lens, lighting, and focus are adequate. |
| Image Detail at Normal Inspection Distance | Suitable for routine condition surveys, blockage checks, maintenance records, and general pipe assessment. | Better suited to detailed defect classification, larger-diameter pipes, evidence capture, and digital cropping during reporting. | Choose 4K when inspection evidence may be reviewed on large displays or cropped later. Resolution alone cannot compensate for dirty lenses, motion blur, poor focus, or insufficient light. |
| Frame Rate and Motion | Commonly available at 25 or 30 frames per second, depending on the recording system and regional video settings. | Often available at 25 or 30 frames per second, but some systems reduce frame rate at maximum resolution. | Confirm the actual recording frame rate at the selected resolution. A stable 25–30 fps is generally preferable for smooth cable movement and defect review. |
| Storage Demand | Lower storage and network bandwidth requirements; easier to archive and transfer in areas with limited connectivity. | Approximately four times the uncompressed pixel data of 1080p; actual file size depends on codec, bitrate, frame rate, and recording format. | For 4K, verify storage capacity, export time, backup policy, and compatibility with the inspection-reporting software. H.265 can reduce file size, but playback support should be checked. |
| Low-Light Performance | Can produce a clear inspection image with moderate illumination because fewer pixels are being recorded. | Can show more detail, but the additional detail is useful only when illumination, sensor sensitivity, focus, and image processing are well matched. | Request sample footage recorded inside a dark, wet pipe rather than relying only on a resolution label or a daylight demonstration. |
| LED Output Measurement | Evaluate actual brightness at the working distance; LED count alone is not a reliable performance indicator. | Use the same measurement approach as for 1080p, but prioritize even illumination across the viewing area to support high-resolution detail. | Ask whether the supplier specifies lumens, lux at a stated distance, beam angle, dimming range, and color temperature. A measured lux value at the pipe wall is more useful than the number of LEDs. |
| LED Adjustment | Prefer continuously adjustable or multi-level LED control to prevent glare, reflection, and washed-out wet surfaces. | Prefer independent or finely adjustable LED control because excessive brightness can reduce visible texture and create reflective hotspots. | Useful controls include manual dimming, automatic exposure, adjustable gain, and a lockable brightness setting for repeatable surveys. |
| Camera Head Movement | Available as fixed-view or pan-tilt configurations. Fixed-view heads are usually simpler and less costly. | Most valuable when paired with a pan-tilt head, optical zoom, or high-quality digital zoom for close inspection of defects. | For routine line inspections, a fixed camera may be adequate. For asset assessment and connection surveys, pan-tilt capability generally provides greater diagnostic value. |
| Pan Coverage | Common pan-tilt systems may provide continuous 360° rotation, while some designs offer a limited pan range. | Common pan-tilt systems may also provide continuous 360° rotation; verify whether the specification means unlimited rotation or a limited angular range. | Ask for the exact pan range, rotation speed, control method, and whether the camera can maintain orientation during continuous rotation. |
| Tilt Coverage | Typical pan-tilt designs provide approximately 180° tilt coverage, but the usable range depends on the camera housing and cable entry design. | Typically similar to 1080p because tilt coverage is a mechanical feature rather than a resolution feature. | Confirm the actual upward and downward tilt angles, the minimum pipe diameter for movement, and whether the head can inspect lateral connections without repositioning the crawler. |
| Pipe-Diameter Suitability | Often suitable for small- to medium-diameter service lines when matched with the correct camera head and centering equipment. | Often preferred for medium- to large-diameter pipes where the additional pixels can be used across a wider field of view. | Do not select by resolution alone. Match the camera head diameter, lens angle, centering wheels, cable length, and crawler size to the target pipe range. |
| Lens and Field of View | Wide-angle lenses can cover more pipe circumference but may make small defects appear smaller near the image edges. | High resolution supports cropping, but a very wide lens can still reduce effective detail on distant or edge-of-frame defects. | Compare horizontal and diagonal field of view, minimum focus distance, optical distortion, and whether the lens is replaceable or protected by a sapphire or hardened window. |
| Water and Dust Protection | Camera heads for sewer work should have a clearly stated IP rating; IP68 is commonly specified for equipment designed for temporary or continuous immersion, subject to the manufacturer's test conditions. | Requires the same environmental protection as 1080p. Higher resolution does not improve sealing or chemical resistance. | Check the test depth, test duration, connector sealing, pressure rating, and compatibility with wastewater, cleaning chemicals, and temperature conditions in the target market. |
| Cable and Reel Selection | Available with various push-rod lengths and stiffness levels; shorter systems are easier to transport for building and service-line work. | May require higher data-handling capacity and a compatible reel, controller, and recording unit. | Specify cable length, diameter, minimum bend radius, locating sonde frequency, counter accuracy, and whether metric or imperial distance units are supported. |
| Video and Reporting Compatibility | Generally easier to play, edit, transfer, and embed in standard inspection reports. | Requires confirmation of codec, container format, bitrate, subtitles, time stamps, defect tagging, and export compatibility. | For international operations, select systems that support common file formats, selectable date and time formats, multilingual overlays, and metric/imperial measurements. |
| Power and Regional Deployment | Verify input voltage, frequency, battery chemistry, charger approvals, and operating time for the destination country. | May have higher processing and display power requirements, depending on the controller and monitor. | For global procurement, confirm the permitted mains input range, plug options, battery transport documentation, replacement battery availability, and local service support. |
| Best-Fit Application | Routine inspection and lower data overhead | Detailed evidence and future-proof archiving | Choose 1080p for cost-sensitive, high-volume work where standard reporting is sufficient. Choose 4K when defect detail, cropping, long-term records, or large-pipe inspection quality justifies the added system and storage requirements. |
