The QUESTemp° 44, 46, and 48N Heat Stress Monitors are built to make heat stress management straightforward, especially in tough, high-heat environments where daily equipment maintenance isn’t practical.
These monitors ditches the traditional water-based sensors in favor of advanced, waterless technology that accurately calculates wet bulb globe temperature (WBGT) the go-to standard for measuring heat stress.
Perfect for safety professionals in industries like construction, manufacturing, and other physically demanding workplaces, the QUESTemp° series provides clear, on-the-spot guidance for safe work-rest cycles, helping teams stay productive and protected.
Equipment Type: Heat Stress Monitors
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Every job site has its challenges, but heat is one of the hardest to manage—it sneaks up on people. That’s where the QUESTemp° Heat Stress Monitors come in.
Think of them as an early warning system: they don’t just take the temperature, they translate it into actionable insight for worker safety. By combining rugged design with smart, maintenance-free sensors, these monitors give safety managers the confidence to make quick decisions that keep crews productive and protected in even the harshest conditions.
Traditional heat stress monitors can slow you down with daily upkeep, but the QUESTemp° 44, 46, and 48N eliminate that hassle with waterless wet bulb sensing technology.
Using a precision humidity sensor and proprietary algorithm, they deliver accurate WBGT readings without the need to constantly add or check water.
And because they’re built for demanding worksites, each unit carries an IP54 rating, meaning it’s tough enough to resist dust, dirt, oil, and water, even in harsh industrial environments.
Together, these features make the QUESTemp° series both reliable and ready for real-world conditions.
The QUESTemp° 44, 46, and 48N don’t just tell you how hot it is—they break down the full story of what workers are experiencing. They measure air temperature, humidity, radiant heat from surfaces or the sun, and even how hot it actually feels when all those factors combine.
This is what makes WBGT such a reliable standard for heat stress. On top of real-time readings, these monitors can store data throughout the day, so you can go back and see exactly when conditions started to get risky.
And with the companion Detection Management Software (DMS), safety teams can easily turn that data into charts and reports, making it simple to spot patterns and improve heat safety plans over time.
The QUESTemp° 44, 46, and 48N are built to keep up with long shifts in tough environments. They can run for up to 80 hours on standard 9V batteries or 160 hours on rechargeable NiMH batteries, and each unit also comes with an AC adaptor for continuous use.
Lightweight and portable, the monitors include a lanyard for hands-free carrying and can be mounted on a tripod or remote sensor bar for monitoring conditions up to 200 feet away. Everything is designed with the worker in mind, making it simple to set up, carry, and rely on throughout the day.
Numbers alone don’t keep workers safe, it’s knowing what those numbers mean that makes the difference. The QUESTemp° 44, 46, and 48N take the guesswork out of heat stress management by displaying work-rest recommendations based on established safety standards.
Depending on the model, they can show guidance aligned with ACGIH TLVs and other recognized exposure limits. This gives safety teams instant clarity on when it’s time for workers to rest, hydrate, or rotate.
At MFE Inspection Solutions, we provide the QUESTemp° series so your crews have the reliable tools they need to stay safe, productive, and compliant—even in the toughest environments.
| Dry Bulb, Globe temp, Relative humidity | Included on all models |
| WBGT (Indoor) Index | Included on all models besides the QT°48N |
| Heat index / HUMIDEX | Included on all models besides the QT°48N |
| Temperature Reading | Celsius or Fahrenheit |
| Data Logging Intervals | 1, 2, 5, 10, 15, 30 or 60 minutes |
| Event Logging Mode | QT°48 Specific |
| Display Languages | Choose from English, French, German, Italian, and Spanish |
| Head-Torso-Ankle Weighted Average WBGT | Optional with QTº44 & QTº46 sensors |
| Sensor Assembly | -5° C to 100° C (23° F to 212° F) |
| Electronics | -5° C to 60° C (23° F to 140° F) |
| Detection Management | DMS Software |
| Computer Data Output Ports | RS-232 serial printer / computer interface; Parallel printer interface |
| 9V Disposable Batteries (Standard); Hours of Battery Life | 80 Hours |
| NiMH Rechargeable Battery (must select -BATTx20 part number); Hours of Battery Life | 160 Hours |
| AC Power Adaptor Wall Power Cube (Included) | Included on all models besides the QT°48N |
| D-ring with Lanyard Attachment | QT°48N specific |
| Tripod mount / Remote Sensor Bar | Included on all models. Allows for up to 61 m (~200 ft) long distance measurement |
| Ingress Protection Rating | IP54 water & dust |
| Case Size (including mounted sensor assembly) | 23.4 x 18.3 x 7.6 cm (9.2” x 7.2” x 3”) |
| Weight | 1.2 kg (2.6 lb) with mounted sensor assembly |
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