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

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 athletic trainers, military, occupational (Industrial) hygienists, outdoor workers and 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.

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℉
• Accuracy@15~40℃ : ±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℉
• Accuracy : ±1.5℃ / ±2.7℉
• Air temperature (TA):
• Range : 0~50.0℃ / 32.0~122.0℉
• Resolution : 0.1℃ / 0.1℉
• Accuracy @15~40℃ : ±0.8℃ / ±1.5℉
• Black globe temperature (TG):
• Range : 0~80.0℃ / 32.0~176.0℉
• Resolution : 0.1℃ / 0.1℉
• Accuracy @15~40℃ : ±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℉
• 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 .
• LCD: 52mm(W)x36mm(L) monochrome LCD and backlight.
• Standard accessories:
• 9V battery x 1
• User’s manual x 1
• Carrying x 1

Special Notes:

*GMM Technoworld 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 Calibration Certificate No. CTS 2612M-23 dated 4 Dec 2023.

**GMM Technoworld 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 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.