Model: TK421 | Brand: Guide Sensmart
The Guide Sensmart TK421 Thermal Vision Monocular is a high-performance device designed for enhanced visibility in various outdoor conditions, particularly low light or darkness. Featuring a 400x300 resolution sensor and a 50Hz refresh rate, it provides clear thermal imaging for applications such as hunting, wildlife observation, and surveillance. Its compact and durable design ensures reliable operation in challenging environments.
Upon opening the package, please verify that all the following items are included:

Image: All items included in the TK421 thermal monocular package.
The TK421 thermal monocular is designed for ease of use and durability. Familiarize yourself with its main components:

Image: The TK421 thermal monocular, highlighting its ergonomic shape and button layout.
Before first use, fully charge the TK421 monocular. The device is equipped with a durable rechargeable battery that provides up to 5 hours of continuous use.

Image: Examples of different color palettes available on the TK421 for varied thermal visualization.

Image: Demonstrating the multi-functional capabilities including PIP mode, ranging, and hot spot tracking.

Image: The TK421 connected to a smartphone via Wi-Fi for remote viewing and recording.

Image: A visual comparison illustrating the enhanced clarity provided by the TK421's thermal imaging capabilities.
Video: A demonstration of the TK421 thermal monocular in use, showing real-time field observation of wildlife. This video illustrates the device's ability to provide clear thermal imagery for identifying subjects in various environments.

Image: Highlighting the durable and waterproof features of the TK421 monocular.
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Battery is depleted. | Charge the device using the provided power adapter and USB-C cable. |
| Image is blurry or unclear. | Eyepiece not focused; lens is dirty. | Adjust the eyepiece focus ring. Clean the objective lens and eyepiece with a soft, lint-free cloth. |
| Cannot connect to TargetIR app. | Wi-Fi is off; incorrect app settings. | Ensure Wi-Fi is enabled on the monocular and your smartphone. Check app permissions and network settings. Restart both devices. |
| Short battery life. | Frequent use of power-intensive features; old battery. | Reduce screen brightness or turn off Wi-Fi when not needed. Ensure the device is fully charged before use. If battery life significantly degrades, contact support. |
| Feature | Detail |
|---|---|
| Model Name | Guide Sensmart-TK 421 |
| Sensor Resolution | 400x300 pixels |
| Pixel Pitch | 17 µm |
| Refresh Rate | 50Hz |
| Zoom Range | 1.7x-6.8x |
| Display Type | 0.4-inch FLOCS screen |
| Display Resolution | 1280x960 |
| Internal Storage | 16GB |
| Battery Life | Up to 5 hours |
| Waterproof Rating | IP66 |
| Drop Resistance | Up to 1 meter |
| Connectivity | Wi-Fi, USB Type-C, Micro HDMI |
| Material | Metal, Plastic |
| Item Weight | 1 Pound |
| Dimensions (LxWxH) | 14.17 x 4.72 x 7.09 inches (Product) |
The Guide Sensmart TK421 Thermal Vision Monocular comes with a three-year warranty, providing peace of mind and protection for your investment.
For technical support, warranty claims, or any inquiries regarding your device, please contact Guide Sensmart customer service. Refer to the quick start guide included in your package for specific contact details or visit the official Guide Sensmart website.
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