The 3M TSI Questemp 46 is a premium, area-monitoring heat stress instrument engineered for occupational health, industrial safety, military operations, and athletic training.

Its standout feature is Waterless Wet Bulb Technology, which calculates wet bulb temperature using high-accuracy relative humidity and dry bulb sensors. This completely eliminates the need for distilled water reservoirs, wicks, and frequent field maintenance—allowing safety officers to deploy the monitor instantly in harsh environments.

Key Features

• Waterless Wet Bulb Design

  Saves time and eliminates field hassle. No wicks to clean, no water reservoirs to fill, and no risk of mold or dry-out during long deployments.

• Built-in Work / Rest Guidance

  Automatically calculates recommended stay times and work-rest ratios based on global safety standards including ACGIH TLV, U.S. Navy PHEL charts, U.S. Marine Flag systems, and EPRI limits.

• Complete Environmental Metrics

  Measures dry bulb temperature, globe temperature, and relative humidity to instantly compute indoor and outdoor WBGT (Wet Bulb Globe Temperature), Heat Index, and Humidex.

• Datalogging & Report Generation

  Stores time-history environmental data for seamless export to TSI Detection Management Software (DMS) for official OSHA/safety compliance reporting.

• Rugged & Field-Ready

  Built to IP54 standards for dust and splash protection, providing up to 80 hours of continuous operation on a single 9V alkaline battery.

Technical Specifications 3M TSI Questemp 46

What’s in the Box

1. 3M TSI Questemp 46 Monitor Unit

2. Sensor Bar with Waterless Sensor Assembly

3. Calibration Verification Module

4. 9V Alkaline Battery & AC Power Adapter

5. Storage / Transport Carrying Case

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