BTMETER BT-881W Heat Stress Meter WBGT Anemometer - Portable Indoor/Outdoor WBGT, Wind/Temp/Humidity

The BTMETER BT-881W is a handheld WBGT heat stress meter that also measures wind speed, ambient temperature and humidity for indoor and outdoor environments.

Compact and battery-powered, the BT-881W combines an anemometer and a Wet Bulb Globe Temperature (WBGT) monitor in one tool so you can assess heat stress, airflow and environmental conditions on the spot. It gives readable digital output with selectable units, a backlit display, and modes for indoor or outdoor WBGT, making it practical for fieldwork, HVAC checks, athletic events or workplace safety spot checks.

How accurate and reliable is the BT-881W for measuring wind, temperature and humidity?

The BT-881W uses upgraded sensors that deliver close tolerances for common environmental checks. Wind speed is accurate to about ±5%, temperature to ±0.6°C with 0.1° resolution, and humidity reads with 0.1% RH resolution, making it suitable for routine monitoring and troubleshooting.

• Wind range: 0–30 m/s with MAX/MIN capture modes for gusts and averages.
• Temperature range suitable for most work and recreation: - (operational range noted on device) with 0.1° display steps.
• Humidity span: 0.1%–99.9% RH with fine resolution for precise readouts.

What measurements and modes does this device provide for heat-stress assessment?

Beyond basic air metrics, the BT-881W calculates WBGT and monitors black globe temperature to reflect radiant heat exposure. It supports separate indoor and outdoor WBGT modes and can be set to alarm when globe temperatures cross a defined threshold, helping identify hazardous heat conditions quickly.

• WBGT readout for combined heat, humidity and radiant effects.
• Black globe temperature (TG) monitoring with adjustable alarm range (20–50°C).
• Indoor/Outdoor mode selection to account for direct sunlight vs. shaded conditions.

How easy is it to use in the field and what unit options are available?

The BT-881W is designed for straightforward operation: a one-button mode switch, data-hold function to freeze readings, and a backlit LCD for low-light work. It supports multiple unit choices and auto power management to conserve batteries during long deployments.

• Five wind units: m/s, ft/min, knots, km/h, mph for compatibility with regional preferences.
• Two temperature units (°C/°F) and a quick data-hold feature for recording.
• Auto power-off and a clear backlit screen for evening or dim conditions.

What build quality and support come with the BT-881W?

BTMETER calibrates each unit prior to shipping and provides a one-year warranty plus lifetime technical assistance. The handheld housing and sensors are intended for routine field use—ideal for inspections and portable monitoring—while calibration ensures consistent results out of the box.

• Factory calibration for dependable measurements straight away.
• 365-day warranty and ongoing technical support from the manufacturer.
• Portable, battery-powered construction for on-site testing.

Who is this for: The BTMETER BT-881W suits technicians, safety officers, coaches, event organizers and outdoor workers who need concise, portable environmental readings. Use it for HVAC balancing, drone and equipment checks, industrial site safety, athletic event monitoring or any situation where wind, temperature, humidity and WBGT inform decisions about comfort and risk.