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General Tools WBGT8778 Heat Index Monitor1 / 6
Product guide

General Tools WBGT8778 Heat Index Monitor

The General Tools WBGT8778 heat index monitor displays wet bulb globe temperature, globe temperature, air temperature, and relative humidity. It also reports dew point and wet-bulb temperature, making it aimed at heat-condition monitoring for HVAC/R and outdoor sports medicine settings.

At a glance

  • Displays ambient air temperature, relative humidity, dew point and wet-bulb temperature.
  • Measures WBGT, globe temperature, air temperature and relative humidity.
  • The listing identifies HVAC/R and outdoor sports medicine as intended applications.
  • An optional hardware/software kit is described as enabling data logging.
Price
$147.00Save 15%

Reference price: $172.99

Price checked: Nov 14, 2026

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Pros and cons

Pros

  • Combines several heat-condition readings, including WBGT and globe temperature, in one instrument.
  • Two AAA batteries and a user manual are listed as included.

Technical specifications

8 specifications
Identity
BrandGeneral Tools
ModelWBGT8778
Measurements
Temperature measurement range32 F to 122 F
Wet bulb temperature measurement range70 F to 115 F
Measured conditionsWBGT (Wet Bulb Globe Temperature); TG (Globe Temperature); TA (Air Temperature); % (Relative Humidity).
Dimensions and installation
Dimensions listed3.38 x 3.5 x 11.5 inches
Weight listed7 ounces
Materials and protection
Material listedBrass

What to know before buying

  • The stated wet-bulb temperature range is 70 F to 115 F, narrower than the separate temperature range of 32 F to 122 F. An optional hardware/software kit is needed for the described data-logging use, and it is not listed among included contents.

What’s in the box

Included
  • Heat Index Monitor
  • 2 AAA batteries
  • User manual

Who is it for?

A good fit for

  • HVAC/R work where WBGT, globe temperature, air temperature and humidity readings are useful.
  • Outdoor sports medicine and athletic-training environments monitoring heat conditions.

Less suited to

  • Buyers who need the monitor itself to log data without obtaining the optional hardware/software kit.
General Tools WBGT8778 Heat Index Monitor · photo 2
Additional product photo 2

Customer reviews on Amazon

4.8 / 5 · 11 ratings
  • 5 stars85%85%
  • 4 stars15%15%
  • 3 stars0%0%
  • 2 stars0%0%
  • 1 star0%0%

The supplied evidence includes a small set of aggregate ratings that skews toward the highest star category. Without written customer feedback, it does not show what buyers liked or disliked, or how the monitor performed in HVAC/R or sports medicine use.

Frequently asked questions

What measurements does the WBGT8778 provide?

The listing says it measures WBGT, globe temperature, air temperature and relative humidity, and displays ambient temperature, dew point and wet-bulb temperature.

What are its listed temperature ranges?

The general temperature range is 32 F to 122 F. The separate wet-bulb temperature range is 70 F to 115 F.

Can it record readings as a data logger?

The listing says an optional hardware/software kit turns the instrument into a data logger. That kit is not listed as included.

General Tools WBGT8778 Heat Index Monitor · photo 3
Additional product photo 3

Alternative options

Product details in Markdown