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Amprobe® Test Tools
Data Sheet
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In the unlikely event
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Tool requires warranty
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it, on the spot.
(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
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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