Heat Stress Wet Bulb Globe Temperature (WBGT) Meter
with Dew-Point (DEW) and Wet bulb (WET)
with Datalogger
(Model No.: TM- 188D)

Quality Product ~ Made in Taiwan

The HEAT STRESS WBGT METER is quick-response with accurate measurement for the effects of temperature, humidity, and direct or radiant sunlight.

This instrument is ideal for the athletic trainers, military, occupational (Industrial) hygienists, outdoor worker and the sports medicine specialists; and it's designed according to the regulations mentioned below.

In order to measure the WBGT index, you should refer to the following regulations:
ISO7243 : Hot environments. Estimation of the heat stress on working man.
ISO7726 : Ergonomics of the thermal environment-instruments for measuring physical quantities.

Product Description

• Quick-response capacitance sensor, accurate measurement for wet bulb globe temperature(WBGT), black globe temperature(TG), humidity(%RH), air temperature(TA), wet bulb(WET) and dew point(DEW). 
• Max/Min and data hold.
• Low battery indication.
• LCD display with LED backlight.
• Viewing data records.
• Switch the temperature unit to ℃ or ℉. 
• Brass black ball in 50mm diameter.
• WBGT alarm setting.
• Auto power off with disable function.
• Data logging capacity: 12000 records.
• Interface: USB PC serial interface.
• Sampling interval: Max 24 hours; Min 1 Second.

Specifications

• Wet bulb globe temperature (WBGT) :
  • indoor & Outdoor without sunlight : WBGT = (0.7×WET)+(0.3×TG)
    • Range : 0~59.0℃ / 32.0~ 138.0℉
    • Resolution : 0.1℃ / 0.1℉
    • *Accurancy@15~50℃ : ±1.0℃ / ±1.8℉
  • Outdoor With sunlight : WBGT=(0.7×WET)+(0.2×TG)+(0.1×TA)
    • Range : 0~56.0℃ / 32.0~ 132.0℉
    • Resolution : 0.1℃ / 0.1℉
    • *Accurancy@15~50℃ : ±1.5℃ / ±2.7℉
• Air temperature (TA):
  • Range : 0~50.0℃ / 32.0~122.0℉
  • Resolution : 0.1℃ / 0.1℉
  • *Accuracy @15~50℃ : ±0.8℃ / ±1.5℉
• Black globe temperature (TG):
  • Range : 0~80.0℃ / 32.0~176.0℉
  • Resolution : 0.1℃ / 0.1℉
  • **Accuracy @15~60℃ : ±0.6℃ / ±1.1℉
• Relative Humidity (%RH):
  • Range : 1%~99%
  • Resolution : 0.1%
  • Accuracy : ±3.0%RH(20~80%) / ±5.0%RH(80%)
• Dew point temperature (DEW):
  • Range : -35.3~48.9℃ / -31.5~120.1℉
  • Resolution : 0.1℃ / 0.1℉
  • The value is calculated from the RH and Air temperature.
• Wet bulb temperature (WET):
  • Range : -21.6~50.0℃ / -6.9~122.0℉
  • Resolution : 0.1℃ / 0.1℉
  • *Accuracy @15~50℃ : ±0.8℃ / ±1.5℉ (based on TA)
  • The value is calculated from the RH and air temperature.
• Dimension : 300 x 70 x 50mm (L x W x H)
• Weight : 220g. (Without batteries).
• Power supply : 9V battery or AC100~240V DC 9V/ 0.5A(9mm).
• Battery life : 200 hours.
• Operating Temperature & Humidity : 0°C to +50°C.
• Storage temperature & humidity : -10°C to +50°C .
• Data output : USB PC serial interface,12000 records.
• LCD : 52mm(W)x36mm(L) monochrome LCD and backlight.
• Standard accessories:
  • 9V battery x 1
  • User’s manual x 1
  • Carrying x 1
  • USB cable x 1
  • US plug Power Adapter, AC100~240V to DC9V/0.5A x 1
• Please download latest installation software from this website

Special Notes:

*GMM Technoworld Pte Ltd re-verification the upper range of Air Temperature (TA) of TM-188/188D, 50℃ meet the MOM's requirements accuracy of ±1℃. Reference to Caltek Pte Ltd, Calibration Certificate No. CTS 2612M-23 dated 4 Dec 2023.

**GMM Technoworld Pte Ltd re-verification the upper range of Globe Temperature (TG) of TM-188/188D, 60℃ meet the MOM's requirements accuracy of ±2℃. Reference to Caltek Pte Ltd, Calibration Certificate No. CTS 2656M-23 dated 20 Dec 2023.

Based on above confirmation, the upper range of both WBGT (50℃) and Wet bulb temperature (50℃) would meet the MOM's specification.

We ONLY provide the Calibration Certificate No. CTS 2612M-23 dated 4 Dec 2023 and Calibration Certificate No. CTS 2656M-23 dated 20 Dec 2023 to our GMM's customers upon request.