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  • Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration
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Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration

6 customer reviews

Price: $32.00 ($32.00 / Hygrometer) & FREE Shipping on orders over $35. Details
Only 8 left in stock (more on the way).
Ships from and sold by Amazon.com.
Standard
  • Enter your model number above to make sure this fits.
  • Plastic molded case and reservoir
  • Temperature Range: -10 to 130°F (-15 to 50°C)
  • Dimensions: 4" x 10"
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$32.00 ($32.00 / Hygrometer) & FREE Shipping on orders over $35. Details Only 8 left in stock (more on the way). Ships from and sold by Amazon.com.

Frequently Bought Together

Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration + Reed Instruments WD-5-WICK Replacement Wicks for the Reed WD-5 Hygrometer
Price for both: $48.21

Buy the selected items together


Technical Details

Style: Standard
  • Brand Name: Reed Instruments
  • Part Number: WD-5
  • Style Name: Standard
  • Maximum Measurement: -5 to 50 Degrees C
  • UPC: 696743252730

Product Description

Style: Standard

The REED WD-5 Wet/Dry Bulb Hygrometer measures relative humidity by comparing readings of wet bulb and dry bulb thermometers using relative humidity tables supplied. Its accuracy is obtained by creating rapid air circulation around the bulbs. It is a non-mecury red spirit filled thermometer. Comes with NIST Calibration Certificate.


Product Information

Style Name: Standard
Technical Details
Part Number WD-5
Item Weight5.6 ounces
Product Dimensions12.5 x 3.1 x 1.5 inches
Item model numberWD-5
StyleStandard
Item Package Quantity1
Temperature Range-5/50 °C
  
Additional Information
ASINB008S0KJEG
Best Sellers Rank #221,001 in Home Improvement (See top 100)
Shipping Weight5.6 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableJune 10, 2010
  
Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.
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Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

5 of 5 people found the following review helpful By VIC on October 24, 2013
Style Name: Standard Verified Purchase
I purchased this in order to calibrate an Ambient Model WS-1171 Weather Station that I had just purchased here at Amazon. This is the first unit I have seen that actually allowed you to calibrate the humidity, which is always notoriously off on these cheaper non-professional units. A wet-bulb/dry-bulb thermometer is the second best way to get an accurate reading of humidly. (The best is a sling psychrometer but they are more expensive and the really cheap ones break easily) (and no local weather stations at the airports unless they are NOAA certified are not much more accurate and you need something close by anyway)

The product came in good condition and worked like a charm. Be advised you need air blowing across it and you must allow time for it to stabilize before taking a reading. I used a fan about 6 feet away and took readings on it after 45 minutes at 5 min intervals until it stabilized. That took about 1 hour.

I only had two minor complaints. I would like to have had a larger unit that was easier to read. And the tables provided were set to use degrees centigrade as the primary measurement making it even harder to read since that is a narrower scale. This issue was there mainly because I am getting old and have a hard time seeing small stuff. But it was easy to get around by going to the internet and downloading a picture of a chart and blowing it up.
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4 of 5 people found the following review helpful By Tim O. on December 8, 2013
Style Name: Standard
PRO:
Thermometers are relatively accurate. They matched our NIST certified thermometer to within 2-F.
Easy to set up and use.
Consistent reading.

We use two Reed, two electronic "certified" and one dial-and-needle unit to check each other.

CON:
Included Relative Humidity Table is INAPPROPRIATE for our area. Table values are strange and may be wrong.
For example, Dry-Bulb 68-F with 9.0-F depression yields 56% RH. The correct RH should have been 59% or, depending on barometric reading (elevation), 58.24% for our area.

CORRECTIVE MEASURES:
1. National Weather Service (NWS) offers RH Tables (online) that account for elevation variations:
[...]

We use the table that matches our elevation. You can use Google Earth or USGS Topo map to find your elevation. If you use these tables, please know that the LOWER number in each cell is the RH.

2. NWS also offers a calculator:
[...]

Use Reed's Wet-Bulb and Dry-Buld readings with local NWS website barometric reading to get a realistic localized RH value. This calculation helps to independently confirm the NWS chart values.

Electronic Hygrometer, even so-called "Certified" ones are useless and totally wrong for our region (SF Bay Area). They are often 10% off the Dry-Wet and needle-and-dial readings.
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Style Name: Standard Verified Purchase
We've had these for years. THe only drw back is that algae will grow on the wet bulb. We add a drop of bleach to the water to stop that.
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Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration
This item: Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration
Price: $32.00
Ships from and sold by Amazon.com