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MAX / MIN Feature 

When the meter is turned on it begins keeping track of the highest (Max) and lowest (Min) 
temperature and relative humidity readings. To view these readings at any time, press the 
MAX/MIN key. 

The maximum temperature and humidity readings will appear along with the MAX display 
icon. Press the MAX/MIN key again to view the minimum temperature and relative 
humidity readings. The minimum temperature and humidity readings will appear along with 
the MIN display icon. 

Press MAX/MIN key again to exit this mode. 

To Clear

 

the MAX/MIN readings, press the CLEAR key once with the MAX or MIN value in 

the display. The meter will clear the existing records and begin storing new MAX/MIN 
records. Note that the MAX/MIN records are automatically cleared when the meter is 
turned off. 

Comfort Level Feature 

The Comfort Level display (‘Wet’, ‘Dry’, or ‘Comfort’ icons) will appear at the center of the 
LCD. 

For humidity measurements below 40%, the meter displays the ‘DRY’ icon. This region of 
humidity can be harmful to furniture and other wood products where splitting and cracking 
could occur after prolonged exposure. Electronic equipment is also at risk in this region 
from static electricity. 

For humidity measurements above 70%, the meter will display the ‘WET’ icon. Humidity 
above 70% is not considered safe for dwellings or work areas where mold can form and 
wood can swell and warp. In addition, sensitive objects such as artwork, musical 
instruments, and paper documents can be damaged by high moisture. 

Humidity between 40% and 70% is the most comfortable environment for people, furniture, 
paper, artwork, etc. In this region the meter displays the ‘COMFORT’ icon.  

Battery Replacement 

When the low battery indicator appears (the letter ‘X’ over the battery symbol), replace the 
two (2) 1.5V ‘AA’ batteries thusly: 

Open the rear battery compartment by sliding the compartment cover to the right, replace 
the batteries observing polarity, and close the compartment. 

 

 

99 Washington Street 
Melrose, MA 02176 

Phone

 781-665-

1400

Toll Free 1-800-517-8431

 

Visit us at www.T

estEquipmentDepot.com

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Extech 45320

 Product Info Page

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com 

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