Monnit ALTA Industrial Wireless Dry Contact Sensor (900 MHz)Meet the Monnit ALTA Industrial Wireless Dry Contact Sensor, a robust solution engineered for reliable monitoring of critical contact closures across industrial environments. Designed to detect when two wired contact points come together, this sensor gives you real time visibility without bulky wiring runs. Pair it with an external mechanical switch or a contact plate, and youll receive instant alerts via SMS text or email the moment the contacts