Item Total = $0.00 
Items = 0 
View Cart
United States
1-800-358-5525 or 
log in or register

Extech 4550 Humidity/Temperature Pen, 20 to 90% RH, 14 to 122F

Extech  |   Mfr# 44550  |   Item# DO-37803-14

$44.00 USD/EACH
$37.40 USD/EACH

Are you a reseller or buying in bulk? Call us today.

  • Pocket size with quick and reliable measurements
Pen displays relative humidity and temperature simultaneously. Min/max function displays and holds the maximum humidity and temperature values since power-up in memory; simply press the clear button to reset. Featuring an on/off button, and selectable °F/°C temperature.
What's Included:
one pocket clip and battery.
Product Type Thermohygrometer
RH range (min) 20%
Temp range 14 to 122°F
(-10 to 50°C)
RH range (Max) 90%
RH range 20 to 90%
Max temperature (º C) 50
RH accuracy ±5%
RH resolution 1%
Min temperature (º F) 14
Min temperature (º C) -10
Max temperature (º F) 122
Temp accuracy ±2°F (±1°C)
Temp resolution 0.1°F (0.1°C)
Dimensions 1 in W x 6 in H x 0.75 in D
Temp sensor thermistor
Response time 8 seconds
CE Compliance Yes
Model 44550
Qty/ea 1
Manufacturer number 44550
Brand Extech
Display LCD
Power on LR44 battery (included)


at $174.00 USD/EACH
Usually ships in 25 days.

Technical Resources
Service & Support
Still have questions
Contact Our Experts
for FREE product
application selection
and support.
or call 1-800-358-5525
Custom Ordering Solutions
Custom Ordering Solutions
Let us find the exact product you need. We have access to suppliers full lines - for products beyond what you see here. Call 1-800-358-5525
Questions and Answers

Do you have questions about this product?

Get answers from real customers and in-house experts with AnswerBox.

3 Questions | 3 Answers
Displaying questions 1-3
  • Q:

    Do you have the battery for this unit? LR44
    Asked on 11/14/2012 by Anonymous

    1 answer



      The correct battery is part number 09377-16 .

      Answered on 11/16/2012 by Christina from Technical Support
  • Q:

    Does it comes calibrated? Thanks. What happens when it looses it calibration?
    Asked on 9/14/2010 by Jose from Puerto Rico

    1 answer

    • Staff Reviewer


      This unit comes factory calibrated, if you require a NIST traceable calibration certificate please add part number 17030-28 onto the order of the unit.

      Answered on 9/15/2010 by Jen from Technical Support
  • Q:

    what would the cost be to purchase these with an ISO 17025 certification?
    Asked on 7/28/2009 by Cassie from Hudson NH

    1 answer



      You would need to add item 17030-28 to your order. For pricing and availability please contact customer service (contact information may be found on the website).

      Answered on 7/28/2009 by Jen from Technical Support
Displaying questions 1-3

Do you have a question about this product? 

Product Reviews


by PowerReviews
Extech 44550 Humidity/Temperature Pen, 20 to 90% RH/, 14 to 122F

(based on 1 review)

Reviewed by 1 customer

Displaying review 1

Back to top

(1 of 1 customers found this review helpful)


Handy, accurate device

By Piano Man

from Bethlehem, CT

Verified Buyer


  • Accurate
  • Durable
  • Easy To Use
  • Well Calibrated
  • Works Properly


    Best Uses

    • In The Field

    Comments about Extech 44550 Humidity/Temperature Pen, 20 to 90% RH/, 14 to 122F:

    As a piano technician, I find this little pen quite handy when discussing the conditions that a customer's piano is under. I use it to sell humidity control systems for pianos. Great little device and quite accurate.

    Displaying review 1

    Back to top