Extech 445815
The deice displays three things-- temperature, relative humidity, and dew point. You can set a visual and audible alarm for the humidity level. Fix a limit for the alarm to buzz when the humidity crosses a particular level. Once you set the alarm you can also see it on the display. The alarm also has the options of beeper and flashing light. The device also records the minimum and maximum value for the temperature on a day. You can erase the memory of the device and set the machine to record new highs and lows. The sensor probe of the device can be detaches from meter and placed at remote locations The Remote probe can be used to verify calibration of the field by using the best possible calibration kits. You can place the probe wherever humidity level needs to be known, be it AAC vents, crawl spaces, basements etc. You can both mount it or place it on the stilt stand that comes with it. The mounting kit is also present in the package.
Caliber 4R
This is a small, hardy, and lightweight device. The casement is made of plastic. The display is excellent. It is easy to read and color-coded. The display has analog and digital feed to it. . The tool runs with two CR 2032 batteries that are included in the package. The batteries will last for several months. The device is very user-friendly. There is a switch at back to change from Celsius to Fahrenheit. The garget displays the average high of last three days both for temperature and humidity. The hygrometer is very accurate above 60%.