Dali S253 Thermal Monocular

• 384x288 thermal sensor: The higher native resolution gives the Dali S253 Thermal Monocular a clearer thermal image than entry-level 256-class devices, making it easier to separate animals, people, and background detail at longer distances.
• 25 mm objective with 1100 m detection range: This combination balances reach and portability, giving the monocular enough detection capability for scanning open ground while remaining compact enough for regular field carry.
• 50 Hz refresh rate: A faster image update helps the view stay smoother when panning or tracking moving targets, which is especially useful for observation on the move.
• WiFi, photo and video recording: Built-in connectivity and recording functions let the unit document sightings and share the live view more easily, which is practical for scouting, inspection, and group observation.
• One-handed handheld format: At 500.00 g and with a compact body, the S253 is easier to carry for extended sessions and quicker to deploy for short checks in changing terrain.

About the Dali Thermal Monoculars Series

Dali Thermal Monoculars sit in the brand’s outdoor thermal range and are built for users who need a compact handheld viewer for hunting, wildlife observation, and general outdoor surveillance. Within this family, DALI offers several monocular formats, including the IRtech-S25X series, which is designed around practical field use rather than bulky equipment. The series uses uncooled focal-plane-array thermal detectors, giving users the ability to detect heat signatures in darkness, brush, and difficult weather where conventional optics are limited.

A key characteristic of the series is its focus on handheld usability. Models in the range combine digital zoom, WiFi image transmission, picture-in-picture, hotspot tracking, and onboard photo and video recording, so the monocular is not only an observation tool but also a practical device for documenting what is seen. The series is intended for users who want thermal imaging without the complexity of a weapon sight, and it emphasizes straightforward operation, compact dimensions, and features that support quick scanning and target confirmation in the field.

About the Dali S253 Thermal Monocular

The Dali S253 Thermal Monocular is the higher-resolution option within the S25X format, pairing a 384x288 uncooled FPA sensor with a 25.00 mm objective lens. In practical use, that gives it a useful balance between image detail, field coverage, and handheld portability. Its 2.00x base magnification is well suited to scanning and initial target detection, while the 4.00x maximum magnification helps the user inspect a heat source more closely without changing position. With a 14.00 ° field of view and a stated 1100.00 m detection range, the S253 works well for covering open ground, field edges, and woodland transitions where both awareness and reach matter.

The thermal core uses a 17.00 μm pixel pitch, 80.00 mK NETD, and a 50.00 Hz refresh rate. In practice, this means the image updates smoothly during panning, while the sensor remains capable of showing temperature contrast clearly enough for routine outdoor detection tasks. The HD LCD display with 1280x960 resolution presents the image at a comfortable viewing size, helping with longer observation sessions. Recording functions add practical value: the S253 supports image capture, video recording, video output, and WiFi connectivity, making it easier to save observations or share the view through a mobile device. Its 500.00 g body, Li-ion power supply, and 5.00 h battery life keep it suitable for mobile use, while the waterproof and fogproof construction supports reliable operation in changing outdoor conditions.

About Dali

DALI traces its origins to the Zhejiang Provincial Testing Technology Research Institute, established in 1984. Based in Hangzhou, Zhejiang, China, the company developed specialist expertise in uncooled focal-plane-array detectors and broader infrared thermal-imaging systems. That background is directly relevant to handheld thermal products such as the S253, because it means the company’s outdoor optics are rooted in detector and imaging development rather than only consumer assembly.

The business was restructured in 2001 and later listed on the Shenzhen Stock Exchange in February 2008. Today, DALI develops infrared core components, thermal-imaging systems, optoelectronic inertial-navigation products, and other complex optoelectronic systems. In the outdoor segment, its range includes thermal monoculars, riflescopes, and binoculars, while IRtech is presented as a professional thermal-imaging brand originating from DALI.

Main Features

• Product type: Thermal monocular
• Magnification: 2.00 x
• Maximum magnification: 4.00 x
• Objective lens diameter: 25.00 mm
• Field of view: 243.00 m/1000m
• Field of view (angular): 14.00 °
• Detection range: 1100.00 m
• Thermal sensor type: Uncooled FPA
• Thermal sensor resolution: 384x288
• Pixel pitch: 17.00 μm
• NETD: 80.00 mK
• Refresh rate: 50.00 Hz
• Calibration mode: Automatic, Manual
• Display type: HD LCD
• Display resolution: 1280x960
• Image capture: Yes
• Video recording: Yes
• Video output: Yes
• Connectivity: Wifi
• Built-in rangefinder: No
• Battery type: Li-ion
• Battery life: 5.00 h
• Dimensions: 190.00 mm x 70.00 mm x 70.00 mm
• Weight: 500.00 g
• Working temperature range: - 20°C / + 50°C
• Waterproof: Yes
• Fogproof: Yes
• Color: Black

Warranty

The Dali S253 Thermal Monocular is covered by a 2-year warranty.