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The Winland HA-4 Humid Alert is a humidity sensor accessory that monitors ambient room humidity from 5 to 95% relative humidity, with an accuracy of plus-or-minus 3.0% between 25 and 75% RH. It extends the monitoring capability of several Winland EnviroAlert gateway and console models via a maximum cable run of 1,000 feet, and — unlike Winland's standalone wireless humidity sensor — it may be used in cooler and freezer environments, with an operating range of -40 to +140 degrees Fahrenheit supporting a wide range of conditions. It functions as an add-on sensor for an existing Winland monitoring system rather than as a standalone alerting device.
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