Thermal monocular DALI S253H — 384×288 sensor, 35 mm lens

The DALI S253H thermal monocular is a handheld observation device featuring a 384×288 thermal sensor and a 35 mm objective lens. It provides single-eye thermal imaging for detection of heat signatures and temperature contrasts in low-light or no-light environments. The compact form factor supports quick, on-the-move inspection and observation for outdoor surveillance, wildlife monitoring, search and rescue tasks, and equipment inspection.

Advantages

The 384×288 sensor delivers clear thermal contrast and reliable target detection over short to medium ranges while the 35 mm lens offers a balanced field of view and magnification for identification and situational awareness. Lightweight construction and handheld ergonomics enable extended use with minimal fatigue. The device operates without visible light, allowing discreet observation and operation in total darkness. Built-in controls provide rapid adjustment of image settings for different environments.

Suitable for

• Outdoor surveillance and perimeter checks
• Wildlife observation and nocturnal animal monitoring
• Search and rescue operations and missing person searches
• Industrial inspection of machinery and electrical installations
• Navigation and situational awareness in low-visibility conditions

Key specifications

• Thermal sensor resolution: 384 × 288 pixels
• Objective lens focal length: 35 mm
• Handheld monocular design for single-eye viewing
• Operation in no-light and low-light conditions using thermal radiation
• Compact and lightweight housing for portable use

How to use

Hold the monocular to one eye and use the focus and image controls to obtain a sharp thermal image. Scan the area methodically from left to right or in sweeping arcs to detect heat sources. Adjust image settings as needed to enhance contrast between targets and background. For inspection tasks, aim the lens at machinery or components to identify hotspots or abnormal temperature patterns. Allow the device to acclimate to outdoor temperatures before precise measurements or close-range observation.

Usage recommendations

Use the thermal monocular on a stable stance or with a support when performing extended observations to reduce image shake. For detection at longer ranges, combine careful scanning techniques with pauses to confirm targets. Avoid direct exposure of the lens to rain or heavy condensation; use appropriate protective covers or shelter when necessary.