Watchman Sonic Oil Level Monitor

How it works The Watchman Sonic Oil Tank Gauge consists of a battery operated ultrasonic transmitter installed on your oil tank, which wirelessly transmits a signal for up to 200 metres to the receiver plugged in to a standard 230 volt electrical socket in your home or office so you never run out of oil again! Product Features: Quick and easy to install Suitable for all types of tank, steel or pla...