| | | | | Extech Humidity Meters Selection Guide |  | | |
| | Psychrometers | Hygro-Thermometers | 
RH300
RH305 | 
RH350
RH355 | 
RH390
| 
RH401
RH405 | 
RH101
| 
445580
445582 | 
44550
| | % Relative Humidity | • | • | • | • | • | • | • | | Temperature | • | • | • | • | • | • | • | | Dew Point | • | • | • | • | | | | | Wet Bulb | • | • | • | • | | | | | IR Thermometer | | | | • | • | | | | Max / Min Memory | • | • | • | | • | • | • | | Differential Temp. | • | • | | • | | | | | Datalogging | | • | | | | | | | PC Interface | | • | | • | | | | | Real - Time Stamp | | • | | | | | | | NIST Cal Available | • | • | • | • | • | • | • |
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EA20
EA25 | 
RH520A
| | | | % Relative Humidity | • | • | • | • | | Temperature | • | • | • | • | | Dew Point | • | • | • | • | | Wet Bulb | • | | • | • | | Max / Min Memory | • | • | • | | | Audible / Visual Alarm | | • | | | | Real Time Stamp | | • | | | | Remote Probe | • | • | | • | | Graphical Display | | • | | | | PC Interface | (EA25 ONLY) | • | | • | | NIST Cal Available | • | • | • | • |
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