The Apollo Smart Alarm is a two-part level measuring device, consisting of a transmitter (measuring device/display) and a receiver (LCD display). The measuring device is designed for easy monitoring of levels in storage and container tanks. It measures the distance to the current level in the tank using ultrasound and transmits the data wirelessly to the receiver. The results can be read on both the transmitter and receiver. The transmitter displays the current tank content in a 10-step bar graph, while the receiver shows the values in liters and percentages. The device is used for monitoring tanks containing heating oil, diesel, and other liquid media such as lubricating oils, biodiesel, used oil, cleaning agents, Ad Blue, and water.