Wireless humidity sensors allow you to monitor the relative humidity of the air within a room or enclosure. Ideal for monitoring humidity within greenhouses, industrial spaces, museums, saunas and humidors. They can also be used for residential applications such as controlling mold, mildew or dust mites. Available with or without probe and various wire lengths. 
 
Specifications:
Accuracy:  ± 3% under normal conditions ( 10% - 90% RH )
RH Operating Range:  0 – 100% RH
RH Response Time:  8 sec ( tau 63% )
Weight:  3.7 oz
Security:  Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Battery Type:  2 Replaceable AA 1.5 V Batteries
Dimension:  4.375 in x 2.470 in x 1.12 in
Supply Voltage:  2.0 - 3.8 V (2 x AA 1.5V Batteries or Optional Power Supply)
Battery Life:  At 1-hour heartbeat setting, included AA batteries will typically last 6-8 Years. **
Max Operating Temperature Using AA Alkaline:  -18°C to 55°C (0°F to 130°F)
Max Operating Temperature Using AA Lithium:  -40°C to 60°C (-40°F to 140°F)
Optimal Battery Operating Temperature:  +10°C to +50°C (+50°F to +122°F)
Enclosure Material:  ABS
Operating Frequency:  900 MHz Operating Frequency
Certifications:  Complies with Part 15 of the FCC Rules. (FCC ID: ZTL-G2SC1)
                       Complies with Industry Canada standards. (IC: 9794A-G2SC1)
Device Range:  Device Range Up to 1,200 ft. non-line-of-sight, wireless device range*
Security:  Encrypt-RF® (Diffie-Hellman Key Exchange + AES-128 CBC)