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

3.9 out of 5 stars 10 customer reviews

Price: $29.04 ($29.04 / Hygrometer) & FREE Shipping on orders over $35. Details
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Standard
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  • Plastic molded case and reservoir
  • Temperature Range: -10 to 130°F (-15 to 50°C)
  • Dimensions: 4" x 10"

Product Specifications
Part Number WD-5
Style Name Standard
Maximum Measurement -5 to 50 Degrees C
UPC 696735532512
EAN 0696735532512
Import Designation Imported
Item Weight 5.6 ounces
Number of Items 1
Overall Height 10  inches
Overall Width 4  inches
Temperature Range -5/50  Degrees Celsius
Specification for this product family
Brand Name Reed Instruments
UNSPSC Code 41112304

The REED Wet/Dry Bulb Hygrometer measures relative humidity by comparing readings of wet bulb and... See more product details



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$29.04 ($29.04 / Hygrometer) & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com.


Frequently Bought Together

  • Reed WD-5 Wet /Dry Bulb Hygrometer with NIST Calibration
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Total price: $46.33
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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 Details

Style: Standard
  • Product Dimensions: 3 x 12.2 x 1.2 inches ; 5.6 ounces
  • Shipping Weight: 5.6 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
  • ASIN: B008S0KJEG
  • Item model number: WD-5
  • Average Customer Review: 3.9 out of 5 stars 10 customer reviews
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

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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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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Style Name: Standard Verified Purchase
The chart for relative humidity using wet and dry bulb temps is incorrect. I've checked this many times and calculations are all off. The Celsius is fine but the Farhenheit is not.
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Style Name: Standard Verified Purchase
Not sure on the accuracy of the temperatures. I have old thermometers and new lazer thermometers and all do not match.
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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: $29.04
Ships from and sold by Amazon.com