The Fnirsi Thermal Camera (Fnirsi) TDM-120P is a professional hybrid device that combines 120×90 pixel thermal imaging with a True RMS multimeter featuring 19999 counts. This tool speeds up and enhances the accuracy of electrical and mechanical troubleshooting by providing real-time views of hot and cold spots alongside standard electrical measurements. The result of this combination is reduced downtime, improved safety, and data-driven decision-making in industrial and construction environments.
In applications such as HVAC repairs, electrical panel monitoring, industrial equipment maintenance, leak detection, and automotive diagnostics, the TDM-120P—with a 25 Hz refresh rate, thermal sensitivity below 60mK, and automatic hot/cold spot tracking—detects faults earlier than traditional methods. Easy storage on an SD card and USB output also simplify documentation and sharing of test reports.
Key Advantages and Features
Smooth Thermal Imaging: Vanadium oxide sensor with 120×90 resolution and ≤25Hz frame rate for real-time temperature differences and rapid anomaly detection
Temperature Measurement Accuracy: Sensitivity <60mK, adjustable emissivity from 0.01 to 1, and temperature range from -20°C to 400°C with ±2°C or ±2% accuracy (maximum value)
True RMS Multimeter with 19999 Counts: Precise measurement of DC voltage up to 1000V and AC voltage up to 750V, along with resistance, capacitance, diode, and continuity tests, plus Data Hold and Min/Max display
Quick Operation with 2.8-inch Touchscreen: 7 color palettes (Arctic, Hot Iron, Iron Red, Rainbow, Lava, Black Hot, White Hot) for clear visual differentiation
Simple Storage and Reporting: One-click image saving to SD card and USB output for images and data to facilitate reporting and team sharing
Portable and Safe Design: Compact body, Type-C charging, auto power-off settings, temperature unit selection, fixed center indicator, and intelligent hot zone tracking
Technical Specifications
Thermal Imaging Specifications
Item
Value
Model
TDM-120 / TDM-120P
Detector Type
Vanadium Oxide
Infrared Resolution
120×90
Field of View (FOV)
50°
Display
2.8-inch LCD Touchscreen
Frame Rate
≤25Hz
Color Palettes
Arctic / Hot Iron / Iron Red / Rainbow / Lava / Black Hot / White Hot
Temperature Range
-4℉ to 752℉ (-20℃ to 400℃)
Accuracy
±2℃ or ±2% (maximum value)
Temperature Unit
℃ / ℉
Temperature Tracking
Center point display, automatic max/min tracking
Temperature Alarm
Supports high/low limit alarms
Emissivity
Adjustable 0.01 to 1
Languages
Simplified Chinese / English
Multimeter Specifications (TDM-120P only)
Item
Measurement Range
Accuracy
Counts and Measurement Method
19999 Count, True RMS
—
DC Voltage
1.9999V / 19.999V / 199.99V / 1000V
±(0.5%+3)
AC Voltage
1.9999V / 19.999V / 199.99V / 750.0V
±(1%+3)
Resistance
19.999MΩ / 1.9999MΩ / 199.99KΩ / 19.999KΩ
±(0.5%+3)
Resistance
1.9999KΩ / 199.99Ω
±(2.0%+3)
Capacitance
999.9μF / 99.99μF / 9.999μF / 999.9nF / 99.99nF / 9.999nF
±(2.0%+5)
High Capacitance
9.999mF / 99.99mF
±(5.0%+20)
Diode Test
Supported
—
Continuity Test
Supported
—
Data Features
Data Hold, real-time Min/Max display
—
Additional Features
Optimal Measurement Distance: 0.5 to 3 meters
Storage: Plug & Play SD card
Data Output: USB for transferring images and measurements
Smart Settings: Auto power-off at 5/10/20 minutes/off, brightness adjustment, temperature unit switching
Temperature Measurement Design: Fixed center temperature display, dual cursor (center + floating), hot zone tracking
Power Supply: Type-C charging
Safety Note: Read the user manual and observe all warnings before use
Practical Applications
Electrical Maintenance: Identify loose connections, hot fuses, and unbalanced loads in electrical panels with automatic hot spot tracking, while simultaneously measuring voltage and continuity with the multimeter for quick fault isolation.
HVAC and Facility Service: Detect air duct leaks, clogged heat exchangers, and unbalanced fan coil operation with precise temperature mapping; then test electrical components like start capacitors on the same device.
Construction and Safety: Reveal moisture intrusion behind walls, poor insulation, and thermal bridges non-destructively, providing image reports as saved files for clients or project inspectors.
Automotive and Industrial Equipment: Track abnormal friction points in bearings, overheating in drives/inverters, and poor grounding connections; Min/Max capability offers real-time variation analysis for trend assessment.
Who Benefits Most
Electrical and industrial repair technicians needing a single tool for thermal viewing and electrical measurement to reduce troubleshooting time and equipment load.
HVAC contractors and building facility professionals relying on clear documentation with thermal images alongside on-site electrical measurement verification.
Maintenance and safety teams in factories requiring condition monitoring and early detection of hot spots to prevent production downtime and accidents.
Building and energy inspection experts conducting non-destructive evaluation of insulation, moisture, and energy loss with shareable reports.
Comparison with TDM-120
Functionality: The TDM-120P offers combined thermal imaging and True RMS multimeter functions; the TDM-120 supports only thermal imaging.
Efficiency: With the TDM-120P, you can capture thermal maps and measure voltage/resistance/capacitance in one visit, simplifying workflow and reducing onsite time.
Data-Driven Decisions: Integration of Min/Max, Data Hold, and USB/SD output in the TDM-120P makes documentation and fault analysis more efficient compared to the thermal-only model.
Getting Started and Best Practices
For optimal accuracy, adjust emissivity according to surface material (0.01 to 1) and maintain a distance of 0.5 to 3 meters. Use different color palettes to enhance visual contrast based on the scene. Always read safety instructions in the user manual before operation and set high/low temperature alarms according to site safety standards. Regularly save images to the SD card and export via USB to facilitate reporting and sharing findings.
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