www.Amprobe.com
Amprobe® Test Tools
Data Sheet
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and customer service
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our industry exclusive
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In the unlikely event
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Tool requires warranty
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authorized to replace
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(note: $500 MSLP limit)
THWD-3
Relative Humidity
Temperature Meter
Dual display ■
Extended probe stem to ■
easily access air ducts
Dew Point ■
Wet Bulb ■
Min/Max readings ■
The THWD-3 uses a precision capacitance sensor to deliver
accurate performance with long term stability. This high
accuracy instrument measures the full range of relative
humidity from 0% to 100% and features an exceptionally
wide ambient temperature measurement range from
-20 °C (-4 °F) to 60 °C (140 °F). The sensor is mounted on a
long shaft extending from the top surface of the unit,
making probing into ductwork and hard to reach areas
more easy. The large LCD displays two measurements
simultaneously with a full range of display options
including Hold, Min, Max, Dew Point (DP) and Wet Bulb
(WB). The THWD-3 comes with soft carrying case, sensor
cover, battery and manual.
Data Hold ■
Capacitive sensor with ■
protective cover
Auto Power off ■
Carrying Case ■
One year warranty ■
Included Accessories
Carrying case, sensor cover,
battery (installed), users manual
www.Amprobe.com
Amprobe® Test Tools
Data Sheet
©2007 Amprobe Test Tools. All rights reserved.
5/2007 3052169 EN-NP Rev A
Function Range Accuracy
Technical Specifications
Measurement Ranges
Humidity 0 % RH to 100 % RH
5 % RH to 95 % RH: ±3 % RH @ 23 °C
<5%RH, >95% RH ±5 % RH @ 23 °C
Temperature Coefficient: 0.1 x specified accuracy/ °C <23 °C, >23 °C
Resolution 0.1 %RH
Temperature (Dry Bulb) -20 °C to 60 °C: ±0.8 °C
-4 °F to -140 °F ±1.6 °F
Dew Point (DP) -20 °C to 60 °C: ±0.8 °C
-4 °F to -140 °F ±1.6 °F
Web Bulb (WB) -20 °C to 60 °C: ±0.8 °C
-4 °F to -140 °F ±1.6 °F
Resolution 0.1 °C/0.1 °F
Response time (in slowly moving air)
Humidity 180 sec
Temperature 10 sec
General Specifications
Display Dual display
Operating Conditions: 0 °C to 40 °C
Storage Conditions: -10 °C to 60 °C; <70 % RH
Altitude Up to 2000 meters
Sample rate 2.5 times per second
Battery 9 V Battery, NEDA 1604 or JIS 006P or IEC6F22
Battery life 85-hours continuous (with alkaline battery)
Dimension 240 x 54 x 34 mm (9.5 x 2.1 x 1.3 in.)
Weight Approximately 180 g (6.4 oz.)
THWD-3 Relative Humidity Temperature Meter
Amprobe® Test Tools Europe
In den Engematten 14
79286 Glottertal, Germany
Tel.: +49 (0) 7684 8009 - 0
Amprobe® Test Tools
website: www.Amprobe.com
email: info@amprobe.com
Everett, WA 98203
Tel: 877-AMPROBE
