Dingoes, wolves and jackals also all eat mice in order to stay alive. Birds â Flying predators are among mice most fierce hunters. Swooping down on the fields in which mice roam, almost every type of birds that is a carnivore finds mice among the top of its dietary needs. Even domesticated hawks and birds of prey eat frozen mice and feeder mice.
Broadly, there are two types of level measurement, continuous level measurement and point level measurement. In continuous level measurement, the actual level of the media is known at all times from a level transmitter or transducer. Level transmitters most often provide an output of a linear 4 to 20 mA signal proportional to the media height.
Levelling is the measurement of geodetic height using an optical levelling instrument and a level staff or rod having a numbered scale. Common levelling instruments include the spirit level, the dumpy level, the digital level, and the laser level. 1  1 Spirit (optical) levelling.  2 Levelling procedure.