1. Introduction
Thank you for choosing the GOYOJO GR225 Thermal Imaging Scope. This device is designed to provide enhanced visibility for outdoor exploration, wildlife observation, search and rescue operations, and hunting in various light conditions, including complete darkness. This manual will guide you through the setup, operation, and maintenance of your thermal imager to ensure optimal performance and longevity.

2. Product Features
The GOYOJO GR225 Thermal Imaging Scope offers a range of advanced features for superior performance:
- High-Resolution Thermal Imaging: Equipped with 256x192 IR pixels for clear thermal views.
- Extended Battery Life: Up to 6 hours of continuous operation with a durable rechargeable battery.
- Digital Zoom: Features 2X and 4X digital zoom for detailed observation.
- Adjustable Focal Length: 25mm lens for versatile viewing.
- High Frame Rate: 50Hz frame rate for smooth observation of moving targets.
- Multi-Language Support: Supports English, Russian, and German languages.
- IP66 Weatherproof Rating: Designed for one-handed operation, lightweight, drop-resistant, and functional in harsh environments from -20°C to +50°C.
- Hot Spot Tracking Crosshair: Quickly locates and confirms observed objects.
- Intelligent Image Algorithms: Upgraded image quality with enhanced details, clear outlines, and sharp images.
- Picture-in-Picture Function: Provides 2X magnification of the center area without losing the overall field of view.
- Built-in Storage: 8GB internal storage for capturing photos and videos (JPG/MP4 format).
- Type-C Removable Battery: Supports data transfer and fast charging.


3. Setup
- Unpacking: Carefully remove the thermal imaging scope and all accessories from the packaging. Inspect for any damage.
- Battery Installation/Charging: Ensure the Type-C removable battery is fully charged before first use. Connect the device to a DC5V2A power source using the provided Type-C cable. The charging indicator will show the charging status.
- Power On: Press and hold the power button (usually marked with a power symbol) for a few seconds until the display activates.
- Language Selection: Upon first power-on, you may be prompted to select your preferred language (Chinese, Traditional, English, Russian, German). Navigate using the control buttons and confirm your selection.
- Focus Adjustment: Lift the device to your eye and use the adjustable focus lens to achieve a clear, sharp image. Rotate the focus ring until the image is in focus.

4. Operating Instructions
4.1 Basic Operation
- Power On/Off: Press and hold the power button to turn the device on or off.
- Focusing: Adjust the focus ring on the objective lens for a clear image.
- Digital Zoom: Use the designated zoom buttons (often marked with '+' and '-') to cycle through 2X and 4X digital magnification.
4.2 Image Modes
The GR225 offers 6 types of image modes to respond to different scenarios and changing weather conditions. These modes assist in the presentation of images for better observation:
- White Hot: Hot objects appear white.
- Black Hot: Hot objects appear black.
- Red Iron: Displays a spectrum of colors from black to red, indicating temperature differences.
- Rainbow: Uses a full spectrum of colors to represent temperature variations.
- Iron Red: Similar to Red Iron, offering a distinct color palette.
- Glimmer: A specialized mode for specific viewing conditions.
Refer to the device's menu or dedicated buttons to switch between these image modes.

4.3 Advanced Functions
- Hot Spot Tracking: This feature automatically highlights the hottest point in the field of view, making it easier to locate targets.
- Picture-in-Picture (PIP): Activates a magnified view of the central area of the screen, allowing for detailed inspection of a target while maintaining awareness of the wider surroundings.
- Photo and Video Recording: Use the dedicated buttons to capture still images or record videos directly to the built-in 8GB storage. Files are saved in JPG/MP4 format.



4.4 Data Transfer
To transfer photos and videos, connect the device to a computer using the Type-C cable. The device should appear as a removable storage device, allowing you to copy files directly.
5. Maintenance
- Cleaning: Use a soft, lint-free cloth to clean the lens and body of the device. For stubborn smudges on the lens, use a specialized lens cleaning solution. Do not use abrasive materials or harsh chemicals.
- Storage: When not in use, store the device in a cool, dry place, away from direct sunlight and extreme temperatures. Ensure the lens caps are on to protect the optics.
- Battery Care: For long-term storage, charge the battery to approximately 50% and store it separately if removable. Recharge periodically to prevent deep discharge.
- Weather Protection: While the device is IP66 weatherproof, avoid prolonged exposure to heavy rain or submersion in water.
6. Troubleshooting
- Device not powering on: Ensure the battery is fully charged. Try connecting to a power source.
- Blurry image: Adjust the focus ring on the objective lens. Ensure the eyepiece is correctly adjusted for your vision.
- No image/display issues: Restart the device. Check battery level. If the issue persists, contact customer support.
- Cannot transfer files: Ensure the device is properly connected to the computer via the Type-C cable. Check if the computer recognizes the device as a storage drive.
- Hot Spot Tracking not working: Ensure the feature is enabled in the device settings.
7. Specifications
| Parameter | GR225 | GR235 (for comparison) |
|---|---|---|
| Sensor Type | Vanadium Oxide Uncooled Infrared Focal Plane Detector | Vanadium Oxide Uncooled Infrared Focal Plane Detector |
| Objective Lens | 25mm | 35mm |
| Element Size | 12um | 12um |
| Resolution | 256x192 | 256x192 |
| Field of View (FOV) | 7.03°x5.27° | 5.0°x3.8° |
| Focusing | Manual Focus | Manual Focus |
| Frame Rate | 25HZ | 25HZ |
| Noise Equivalent Temperature Difference (NETD) | <40mk@25℃ | <40mk@25℃ |
| Endurance (Battery model: 18500) | 4-5 Hours | 4-5 Hours |
| Eyepiece Resolution | 1440*1080 (OLED) | 1440*1080 (OLED) |
| Eyepiece Size | 0.39inch | 0.39inch |
| Electronic Magnification | X2, X4 | X2, X4 |
| Basic Magnification | 3.6x | 5.0x |
| Degree of View Adjustment | ±5SD | ±5SD |
| Image Mode | White hot, black hot, red hot, pseudo-color, cold color, rainbow | White hot, black hot, red hot, pseudo-color, cold color, rainbow |
| Wifi connection cell phone | Not Supported | Not Supported |
| Picture in Picture | Support | Support |
| Hot Tracking | Support | Support |
| Crosshair Cursor | Support | Support |
| Laser Indicator | Not Supported | Not Supported |
| Photo and video | Support | Support |
| Laser Distance Measuring | Not Supported | Not Supported |
| Interfaces | Type-C | Type-C |
| Language | Chinese, Traditional, English, Russian, German | Chinese, Traditional, English, Russian, German |
| Capacity | Built-in 8GEMMC (approx. 8GB) | Built-in 8GEMMC (approx. 8GB) |
| Photo/Video Format | JPG/MP4 | JPG/MP4 |
| Protection Rating | IP66 | IP66 |
| Weight | ≤580g | ≤580g |
| Size | ≤198*57.5*64.3mm | ≤198*57.5*64.3mm |
| Shock Resistance | 800g/ms | 800g/ms |
| Operating Temperature | -20℃ ~ +60℃ | -20℃ ~ +60℃ |
| Storage Temperature | -30℃ ~ +70℃ | -30℃ ~ +70℃ |
| Detection Distances (Note: Distances are based on actuals and are for reference only!) | ||
| Target | Detection (GR225) | Recognition (GR225) |
| Car | 1300m | 820m |
| People | 930m | 485m |
| Pigs | 887m | 465m |
| Rabbits | 290m | 130m |
| Chicken | 195m | 80m |
| Bird | 110m | 53m |

8. User Tips
Based on general usage and product capabilities, here are some tips for maximizing your experience with the GOYOJO GR225 Thermal Imaging Scope:
- Practice Focusing: Thermal imagers require precise focusing. Practice adjusting the lens in different environments and at varying distances to quickly achieve a clear image.
- Experiment with Image Modes: Different image palettes are better suited for different scenarios. Experiment with 'White Hot', 'Black Hot', 'Rainbow', and 'Iron Red' to find which provides the best contrast and detail for your specific observation needs.
- Utilize Hot Spot Tracking: For quick target acquisition, especially in dense foliage or complex backgrounds, enable the Hot Spot Tracking feature.
- Leverage Picture-in-Picture: When you need to examine a specific area in detail without losing the broader context, use the Picture-in-Picture function.
- Keep Batteries Charged: Always ensure your battery is fully charged before extended outings. Consider carrying a spare charged battery or a portable power bank for prolonged use.
- Protect the Lens: The lens is the most critical part. Always use the lens cap when not in use and clean it gently with appropriate materials.
9. Warranty & Support
For any questions regarding product features, technical assistance, or warranty claims, please contact our customer service. We are committed to resolving any concerns and ensuring your satisfaction.
Contact Information:
- WhatsApp: +86 15211026756
- Email: 15211026756@163.com
Please provide your product model (GR225) and a detailed description of your issue when contacting support for faster assistance.





