Pioneer in the technology of GSM sms alarm devices, legato possesses a team of expertise in engineering and programming of communication controllers. GSM sms alarm messenger has been a success worldwide during the past few years. It is widely installed in control and alarm systems for industrial monitoring, power plant, water supply network, geographical control and security. Temperature & humidity sms alert controller is dedicatedly developed for environmental monitoring and control. It sends sms alarm when temperature or humidity is higher/lower than user preset levels. More importantly, it provides the on/off control of equipments e.g. Air ventilation for maintenance in temperature/humidity range. Application is unlimited where temperature and humidity needs to be monitored on site and remotely.