Watchman Ultrasonic Oil Level Monitor

The Watchman Sonic Advanced is the revolutionery electronic measuring gauge showing how much liquid there is in your tank and setting off an alarm when there is a sudden drop in liquid levels.  

Features - 

• Quick and easy to install and one model fits all
• Unique serial number
• Suitable for steel or plastic tanks
• Sudden drop alarm (on/off)
• Low power consumption
• 200m transmitter to receiver range
• Measures tanks up to 3m in height
• Audible buzzing tone when liquid levels run out