Dali S253H II Thermal Monocular

• 384x288 uncooled thermal sensor: Delivers a clear thermal image for spotting heat sources in darkness, brush, or poor weather, while the 50.00 Hz refresh rate keeps movement looking natural when scanning on the move.
• 35.00 mm objective lens: Balances field coverage with useful reach, helping the monocular detect targets out to 1570.00 m while still remaining practical for handheld observation.
• HD 1280x960 display: Presents the thermal image with enough detail for more confident target recognition and easier prolonged viewing during hunting or general outdoor observation.
• Photo, video and WiFi connectivity: Lets the user record observations and share the live image to a mobile device, which is useful for documenting sightings or viewing with a companion.
• Compact 450.00 g housing: Keeps the unit easy to carry for long periods, while the waterproof, fogproof and shockproof construction supports reliable field use in changing conditions.

About the Dali Thermal Monoculars Series

Dali Thermal Monoculars sit in the company’s outdoor thermal-imaging range and are built for users who need a compact handheld device for hunting and outdoor observation. Within this family, the IRtech-S25X series covers several models that share the same basic concept: a portable monocular format, an uncooled focal-plane-array detector, and practical digital functions intended to make thermal viewing straightforward in the field. Rather than focusing on weapon mounting or specialist tactical use, the series is aimed at scanning terrain, locating heat signatures, and observing wildlife or activity after dark.

Across the range, Dali combines thermal imaging with field-oriented features such as Wi-Fi image transmission, picture-in-picture, hotspot tracking, digital zoom, and onboard photo and video recording. That gives the series a broader role than simple detection alone, since users can both observe and document what they see. The series design also reflects a preference for simple handling and low learning cost, making it suitable for users who want thermal capability without a complicated operating routine. In practice, the result is a family of handheld thermal monoculars built around mobility, fast target acquisition, and practical day-to-night outdoor use.

About the Dali S253H II Thermal Monocular

The Dali S253H II Thermal Monocular is a handheld thermal device built around a 384x288 uncooled FPA sensor and a 35.00 mm objective lens, a combination that gives it useful reach without making the unit bulky. With a stated detection range of 1570.00 m, it is suited to scanning open ground, checking woodland edges, and locating heat sources well before visual details are available through conventional optics. Its 1.00x optical magnification keeps the image intuitive when sweeping an area, while the wide 10.70 ° field of view helps the user cover ground efficiently during handheld observation.

The thermal image is shown on an HD display with 1280x960 resolution, giving the viewer a more comfortable and detailed presentation than a basic low-resolution screen. In practical use, that matters when tracking movement, distinguishing animals from background clutter, or spending longer periods behind the eyepiece. The 50.00 Hz refresh rate supports smoother viewing of moving targets, while the 60.00 mK NETD sensitivity provides the thermal contrast needed for general field observation in varying temperatures.

For day-to-day usability, the S253H II adds photo capture, video recording, video output, and WiFi connectivity, so observations can be stored or shared rather than viewed only in real time. The 450.00 g body and 200.00 mm length keep it manageable for extended carry, and the waterproof, fogproof, and shockproof construction is better suited to wet ground, cold mornings, and rough transport than a more delicate observation device. A rechargeable battery with USB-C power support and a stated 4.00 h battery life rounds out a thermal monocular designed for practical field use rather than static bench viewing.

About Dali

Dali traces its origins to the Zhejiang Provincial Testing Technology Research Institute, established in 1984. The company is based in Hangzhou, Zhejiang, China and focuses on infrared and optoelectronic technologies rather than sporting optics alone. Its expertise includes uncooled focal-plane-array detectors, infrared thermal-imaging cameras and systems, and a broader portfolio of infrared core components and optoelectronic products. The company was restructured in 2001 and later listed on the Shenzhen Stock Exchange in February 2008.

Within the outdoor market, Dali is closely associated with IRtech, a professional thermal-imaging brand identified as originating from Dali. Its outdoor range includes thermal monoculars, riflescopes, and binoculars, reflecting a strong emphasis on handheld and weapon-oriented thermal observation devices. That background is relevant here because it shows that the company develops the underlying thermal technology as well as the finished observation products built around it.

Main Features

• Product type: Thermal monocular
• Magnification: 1.00 x
• Objective lens diameter: 35.00 mm
• Field of view: 186.00 m/1000m
• Field of view (angular): 10.70 °
• Close focus: 1.00 m
• Detection range: 1570.00 m
• Thermal sensor type: Uncooled FPA
• Sensor resolution: 384x288
• NETD: 60.00 mK
• Refresh rate: 50.00 Hz
• Calibration mode: Manual
• Display type: HD
• Display resolution: 1280x960
• Image capture: Yes
• Video recording: Yes
• Video output: Yes
• Connectivity: Wifi
• Built-in rangefinder: No
• Battery life: 4.00 h
• Power supply: Rechargeable Battery, USB-C port
• Working temperature range: -20℃- +50℃
• Length: 200.00 mm
• Width: 71.00 mm
• Height: 71.00 mm
• Weight: 450.00 g
• Waterproof: Yes
• Fogproof: Yes
• Shockproof: Yes
• Color: Black
• Country of manufacture: China

Warranty

2 years. The Dali S253H II Thermal Monocular is covered by a two-year warranty period.