OVERVIEW
• Dual Channel
• Portable battery powered digital LCD temperature display readout
• °C/°F selectable
• Max, Min, Average, T1-T2, and Hold functions
• For Type K or J thermocouple sensor
• Accepts two thermocouple probes
• °C/°F selectable
• Connect probe inputs using mini-thermocouple plugs (included)
• Mesh Carrying Case (included)
• Large LCD display, 5 full digits
• Max, Min, Average, T1-T2 and Hold temperature reading functions
• Portable, 9V battery powered (included)
Includes:
• (1) 9V battery
• (1) Mesh carrying case
• (2) Type K thermocouple test leads
Plug and Play Compatible with the Following TSC Products:
• EGT Probes - All
• CHT Sensors - All
• Stick-On Probes - All
• Thermocouples - All
The HHMD Dual Channel Digital Handheld Display has advanced operations including Max, Min, Average, T1-T2, and Hold temperature reading functions. The unit features a large five digit LCD display. All of our displays are manufactured from high quality materials for optimum performance in your demanding application. Includes (1) 9V battery, (1) mesh carrying case and (2) Type K thermocouple test leads.
IMPORTANT DISCLAIMER IF YOU ARE CONSIDERING USING THIS INSTRUMENT IN AN AIRCRAFT:
This instrument is not certified by the FAA. Fitting of this instrument to certified aircraft is subject to the rules and conditions pertaining to such in your country. Please check with your local aviation authorities if in doubt. This instrument is intended for ultralight, microlight, homebuilt and experimental aircraft. Operation of this instrument is the sole responsibility of the pilot in command (PIC) of the aircraft. This person must be proficient and carry a valid and relevant pilot’s license. This person has to make themselves familiar with the operation of this instrument and the effect of any possible failure or malfunction. Under no circumstances does The Sensor Connection or manufacturer condone usage of this instrument for IFR flights.
TECHNICAL SPECIFICATIONS
Number of Inputs: | 2 |
Input: | Type K, or J thermocouple (User Selectable) |
Display Range - | -328 to 2498°F (-200 to 1370°C) |
Display Range - | -328 to 1922°F (-200 to 1050°C) |
Accuracy: | +/-0.1% of full scale + 0.7°C (K/J Types) |
LCD Display (Primary): | 5-digit, 0.51 inch (13 mm) high, 1 second update rate |
LCD Display (Secondary) | 5-digit, 0.37 inch (9.5 mm) high, 1 second update rate |
Microprocessor Sampling Rate: | 1 sample/second |
Environment: | 0 to 60°C, 80% Max. RH (non-condensing) |
Operating Temperature: | -4 to +140°F (-20 to +60°C) |
Power: | 1x 9V battery |
Battery Life: | 250 hours (typical) |
Case Dimensions: | .1" x 2.2" x 1.5" (130mm x 56mm x 38mm) |
Weight: | 6 ounces (including batteries) |
DOCUMENTS & DOWNLOADS
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About HHMD-TM-82N: 2-Channel Handheld Digital Thermocouple Pyrometer Display
The HHMD-TM-82N is a battery-powered, dual-channel handheld thermocouple thermometer designed for portable diagnostic and verification work. It accepts Type K or Type J thermocouples through standard mini thermocouple connectors and displays both channels simultaneously on a dual-line, five-digit LCD.
The unit operates for approximately 250 hours on a single 9V battery and ships ready to use with two Type K test leads, a battery, and a mesh carry case.
This instrument serves a different role than panel-mounted pyrometers such as the DPG-XR or MPG series. Rather than providing continuous in-vehicle monitoring, the HHMD is intended for setup, troubleshooting, verification, and bench testing. Its compatibility with standard mini thermocouple connectors allows it to be used with TSC probes, EGT sensors, CHT sensors, and surface probes without adapters.
Measurement Functions
The HHMD provides multiple measurement modes beyond basic temperature display:
T1 / T2
Displays both channels simultaneously, updating at approximately one sample per second. This mode is used for monitoring two independent temperature points.
T1–T2 (Differential)
Displays the real-time temperature difference between channels. This provides direct differential measurement without manual calculation.
MAX
Stores the highest temperature recorded on each channel since reset.
MIN
Stores the lowest recorded temperature on each channel.
AVG
Displays a continuously updated average value, smoothing short-duration fluctuations.
HOLD
Freezes the displayed value for recording while measurement continues internally.
Resolution and Accuracy
- Resolution: 0.1°F / 0.1°C
- Accuracy: ±0.1% of full-scale reading + 0.7°C
Higher resolution allows finer comparison between sensors, especially in calibration, verification, or low-variation measurements. In high-variation environments such as EGT monitoring, this increased resolution typically does not provide additional practical benefit.
Thermocouple Compatibility
The HHMD accepts standard mini thermocouple connectors for Type K and Type J probes.
Correct connector type is critical:
- Type K connectors use Chromel/Alumel alloys
- Type J connectors use Iron/Constantan
Using mismatched connector types introduces measurement error.
The polarized connector design prevents reverse insertion and ensures correct polarity.
HHMD vs Panel-Mount Gauges
| Feature | HHMD-TM-82N | DPG-XR |
|---|---|---|
| Power | 9V battery | 9–28 VDC |
| Installation | Portable | Permanent |
| Resolution | 0.1° | 1° |
| Display | LCD | LED |
| Functions | T1, T2, ΔT, MAX, MIN, AVG | Monitoring + alarm |
| Use case | Diagnostics | Continuous monitoring |
Applications
- Sensor verification and troubleshooting
- Cylinder-to-cylinder comparison testing
- Heat exchanger efficiency measurement
- Brake and drivetrain temperature surveys
- Fluid temperature spot checks
- Shop and dyno testing
Summary
The HHMD-TM-82N is a portable dual-channel thermocouple thermometer designed for diagnostic, verification, and testing applications. It provides accurate, flexible temperature measurement across a wide range of sensor types using standard mini thermocouple connectors.