
Economical Humidity/Temperature Sensor 
USB Interface 
RH-USB
Optional*
U Connects Directly to a USB 
Port on Your Computer
U Free Software Converts 
Your PC into a Humidity and 
Temperature Meter, Data 
Logger or Chart Recorder 
U Accurate to ±3% RH, 
±1°C (±1.8°F) 
U 316 SS Housing and 
Removable Stainless Steel 
Sensor Filter 
U Suited for Wall or 
Duct Mounting 
The RH-USB relative humidity/ 
temperature sensor provides a 
reliable and economical method  
for most relative humidity and 
temperature monitoring applications. 
The compact design is ideal for 
wall or duct mounting. Each unit 
is factory calibrated to provide 
excellent sensitivity, fast response, 
and stability. The unit features a 
simple installation with a direct 
USB connection. The free user 
software converts your PC into both 
a humidity and temperature meter, 
chart recorder or data logger. The 
design features a 316 SS NEMA 
4 (IP66) housing. A mounting kit is 
also available that allows for wall or 
duct mounting.
Recording/ 
Logging Software 
Included!
Specifications
Temperature: 
 Range: -17 to 49°C (1 to 120°F) 
 Accuracy: ±1°C (±1.8°F)
Relative Humidity: 
 Range: 2 to 98% RH 
 Accuracy: ±3% RH  
 (at 15 to 90% RH)
Repeatability: ±1% RH 
PC Interface: USB 
USB Cable: Integral to sensor, 
2 m (6') (shielded) Type A plug 
Software (Included): 
Requires Windows® 2000, XP,  
Vista (32-bit) or Windows 7 (32-bit) 
Housing: 316 stainless steel 
Dimensions: 138 L x 16 mm D 
(5.5 x 0.625")
Weight: 67 g (0.18 lb)
Computer not included.
RH-USB shown 
smaller than actual 
size.
Thermocouple 
Probe with USB 
Connection Available. 
See Model TJ-USB  
Visit omega.com/tj-usb
HX70-MKIT wall/duct mounting kit, 
shown smaller than 
actual size.
 To Order Visit omega.com/rh-usb for Pricing and Details 
 Model No.  Description
 RH-USB   Humidity temperature sensor with USB connection
Accessories
 Model No.  Description
 HX70-MKIT   Wall/duct mounting kit 
 CAL-3-HU*   NIST traceable calibration with 3 data points
Comes complete with an integral shielded 2 m (6') USB cable with Type-A connector, free 
software, removable protective sensor filter and operator’s manual.
Ordering Example: RH-USB RH/temp sensor and HX70-MKIT wall/duct mounting kit.
To Order, Call  or Shop Online at omega.com
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