1. Introduction
The Mustool MT13S is a versatile 2-in-1 device combining a thermal imager and a digital multimeter. It features a 2.8-inch resistive touch screen, providing high-resolution thermal images with a 192x192 pixel sensor and comprehensive multimeter functions for measuring voltage, resistance, capacitance, and more. Designed for electrical and automotive diagnostics, this portable tool offers an intuitive interface and robust performance for various applications.

2. Safety Information
Please read and understand all safety information before operating the Mustool MT13S. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always use the device within its specified voltage and current ranges.
- Do not attempt to measure circuits with voltages exceeding the maximum ratings (1000V DC, 750V AC).
- Ensure the test leads are in good condition and properly connected before making any measurements.
- Avoid using the device in wet or damp environments.
- Do not operate the device if it appears damaged or is not functioning correctly.
- Refer to local electrical safety codes and regulations when performing electrical work.
- Keep the device away from children.
3. Product Overview and Components
The Mustool MT13S integrates a thermal camera and a digital multimeter into a compact, handheld unit. Familiarize yourself with the device's layout and controls.
3.1 Device Layout and Buttons

- Power Button: Turns the device on/off.
- Multimeter Data Chart Recording: Initiates data logging for multimeter readings.
- IR Camera / Multimeter Switch Button: Toggles between thermal imaging and multimeter modes.
- Hold / Range Button: Freezes the current display or manually selects measurement range.
- Multimeter Frequency / Duty Cycle Switch Button: Switches between frequency and duty cycle measurements in multimeter mode.
- Menu: Accesses the main menu for settings and functions.
- System Setting: Direct access to system configuration.
3.2 Multimeter Display Elements

- Analog Bar: Graphical representation of the measurement.
- Measurement Data Display Area: Shows the primary measurement value.
- Room Temperature Display: Indicates ambient temperature.
- Bottom Menu Buttons:
- Function switch menu
- Waveform function menu
- System settings menu
- Measurement Modes: Auto Measure, NCV Test, Temperature measurement.
- Click Screen to Switch: V/DC (DC Voltage), V/AC (AC Voltage), Ω (Resistance), Continuity, Diode, Capacitor.
3.3 IR Camera Display Elements

- Maximum Temperature: Highest temperature detected in the field of view.
- Minimum Temperature: Lowest temperature detected in the field of view.
- Center Point Temperature: Temperature at the center of the screen.
- Hot Spot: Visual indicator of the hottest point.
- Electricity: Battery level indicator.
- Date/Time: Current date and time.
- Take Photos: Button to capture thermal images.
- System Settings: Access IR camera specific settings.
4. Specifications
Detailed technical specifications for the Mustool MT13S.
| Parameter | Value |
|---|---|
| Thermal Imaging Parameters | |
| Sensor | Uncooled focal plane |
| Image capture frequency | 20Hz |
| Thermal imaging pixel | 192*192 |
| Display image resolution | 240*240 |
| Field of view (Fov) | 50.0(H) × 50(V)/72.1(D) |
| Emissivity | 0.1-0.99 (tunable), 0.95 (default) |
| Measurement temperature range | -20℃ ~ +550℃ |
| Mode | Automatic gain |
| Color board | Iron Red, Rainbow, Fusion, White Heat, White Heat Highlights |
| Temperature measurement error | >0℃±2℃ or ±2% ≤0℃±5℃ or ±5 |
| Display temperature accuracy | 0.1℃/0.1F |
| Multimeter Parameters | |
| DC highest input voltage | 1000V |
| AC highest input voltage | 750V |
| Resistance highest measurement resistance | 99.99MΩ |
| Capacitance highest measurement capacity | 99.99mF |
| Duty cycle measurement range | 0.1% ~ 99.9% |
| Diode measurement range | 0V ~ 3V |
| On-off test maximum resistance | 999.9Ω |
| Display number | 9,999 words updated about 3 times per second |
| Other Device Parameters | |
| Display Screen | 2.8 inches, 320 by 480 resolution |
| Touch Screen | Resistive touch screen |
| USB interface | Type-C USB |
| Storage capacity | 3.5MB |
| Image format | BMP file |
| Battery | Built-in lithium battery |
| Storage temperature | -20℃ ~ 60℃ (-4 ~ 140F) |
| Working temperature | 0℃ ~ 50℃ (32 ~ 122F) |
| Working humidity | <85%RH (Non-condensing) |
| Product size | 134 mm * 69 mm * 25 mm |
| Product weight | 130g (not including accessories) |


5. Setup
5.1 Initial Charging
Before first use, ensure the device is fully charged. Connect the provided Type-C USB cable to the device's USB port and to a suitable USB power adapter (not included). The battery indicator on the display will show charging status. A full charge ensures optimal performance and battery life.
5.2 Powering On/Off
Press and hold the Power Button (refer to Figure 2) for a few seconds to turn the device on or off.
6. Operating Instructions
6.1 Switching Between Modes
Press the "IR Camera / Multimeter Switch Button" (refer to Figure 2) to toggle between the thermal imaging mode and the digital multimeter mode.
6.2 Multimeter Operation
In multimeter mode, the display shows various measurement options. Use the resistive touch screen to select the desired function (refer to Figure 3).
- Voltage Measurement (DC/AC): Select V/DC or V/AC. Connect the test leads to the circuit to measure voltage.
- Resistance Measurement (Ω): Select Ω. Connect the test leads across the component to measure resistance.
- Capacitance Measurement: Select the Capacitor icon. Connect the test leads to the capacitor.
- Diode Test: Select the Diode icon. Connect the test leads to the diode to check its forward voltage drop.
- Continuity Test: Select the Continuity icon. Connect the test leads to the circuit to check for continuity (a beep indicates continuity).
- Frequency / Duty Cycle: Use the "Multimeter Frequency / Duty Cycle Switch Button" to toggle between these measurements.
- NCV Test: Non-Contact Voltage test. Select NCV to detect AC voltage without direct contact.
- Hold Function: Press the "Hold / Range Button" to freeze the current reading on the display. Press again to release.
- Range Selection: In manual range mode, press the "Hold / Range Button" to cycle through available ranges.
6.3 Thermal Imager Operation
In thermal imaging mode, the device displays a thermal map of the environment. (Refer to Figure 4 for display elements).
- Viewing Thermal Images: Point the camera lens towards the area of interest. The display will show temperature distribution.
- Color Palettes: The MT13S offers five color palettes to visualize temperature differences. Access these through the system settings or dedicated menu.

Figure 7: Available color palettes: Iron Red, Rainbow, Fusion, White Heat, White Heat Highlights. - Iron Red: Good for general temperature distribution.
- Rainbow: Provides a wide spectrum of colors for subtle temperature changes.
- Fusion: Blends visual and thermal images.
- White Heat: Hotter areas appear white.
- White Heat Highlights: Similar to White Heat, with enhanced highlighting of hot spots.
- Adjusting Emissivity: Emissivity (0.1-0.99, default 0.95) can be adjusted in the settings to improve temperature measurement accuracy for different materials.
- Taking Photos: Press the "Take Photos" button (refer to Figure 4) to capture the current thermal image. Images are saved in BMP format to the internal storage (3.5MB capacity).
- Touch Screen Interaction: The 2.8-inch resistive touch screen allows for intuitive navigation through menus and settings.

Figure 8: Demonstrating interaction with the resistive touch screen.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. For stubborn dirt, a slightly damp cloth with mild detergent can be used, ensuring no liquid enters the device. Do not use abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place, away from direct sunlight and extreme temperatures (-20℃ to 60℃).
- Battery Care: For prolonged storage, charge the battery to approximately 50% every three months to maintain battery health.
- Calibration: While the device is factory calibrated, if you suspect inaccuracies, contact customer support for potential recalibration services.
8. Troubleshooting
- Device not powering on: Ensure the battery is charged. Connect to a Type-C USB charger and try again.
- Inaccurate readings: Check test lead connections. Ensure correct measurement mode is selected. For thermal imaging, verify emissivity settings for the material being measured.
- Screen unresponsive: Perform a soft reset by holding the power button until the device restarts. If the issue persists, ensure the screen is clean and dry.
- Cannot save images: Check if the internal storage (3.5MB) is full. Transfer existing images to a computer via USB to free up space.
9. User Tips
No specific user tips were available from reviews or Q&A for this product. However, general tips for using thermal imagers and multimeters include:
- For thermal imaging, practice with known temperature sources to understand how different materials appear.
- Always start with the highest range in multimeter mode when measuring an unknown voltage or current to prevent damage.
- Utilize the data recording feature for long-term monitoring or to capture intermittent events.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the seller's official website or contact their customer service department. Keep your purchase receipt as proof of purchase.
11. Package Contents
The following items are included in your package:
- 1 x Mustool MT13S Thermal Imaging Multimeter
- 1 x Type-C USB Cable
- 1 x User Manual (this document)




