sensorpush ht.w wireless thermometer/hygrometer water-resistant for iphone/android. usa made indoor/outdoor humidity/temperature/dewpoint/vpd monitor/logger. smart sensor with alerts sensorpush your favorite humidity and temperature smart sensor just got even better! featuring: water resistance: durable, splash and rain proof design for interior or exterior use easy battery changes: easy-change battery cap even longer battery life: battery life now estimated at over 2 years in normal conditions made in usa: best of all, they're designed, supported, and now manufactured right here in america and of course, like all sensorpush sensors, the ht.w can measure, record, and alert on dewpoint and vpd (vapor pressure deficit), and works seamlessly with the g1 wifi gateway for remote access. you're busy. you know that proper temp and moisture levels are important. you've already installed humidifiers or dehumidifiers. but who has time for constant monitoring of conditions where they matter most, like refrigerators, freezers, the beer cooler or kegerator, ukelele cases, humidors, snake tank, orchard, or around the household in a kids room or on the patio? sensorpush is the answer. a sensorpush multipurpose smart temperature and humidity meter is compact and easy to use, replacing alarm systems and detectors. it takes just a few moments to install our free app and pair your first sensor and stick it anywhere, even outdoors or in your car. if you love data, sensorpush has it, graphed via in-app reader, web, alexa, or easily exported. keep your finger on the pulse of anything from plant growth to reptiles to your pet's nest to remote weather stations to freeze dryers to curing concrete with a history of minute-by-minute updates from our temperature and humidity recorder. or, just relax. sensorpush is constantly monitoring conditions and you're alerted of issues once your phone connects and data is downloaded from memory via bluetooth. if you’ll be away for awhile, the sensor keeps the last 45 days of data. for maximum safety, add the sensorpush g1 wifi gateway for access and alerts from anywhere, via the internet.