Definition 1: by the vial tilt sensors or electronic parts. Anping or for measuring small angle.
Applied science: Surveying and Mapping (a subject); surveying instruments (two subjects)
Definition 2: The liquid bubbles to indicate the horizontal position of the balance or said reference position of the device.
Respective disciplines: mechanical engineering (a subject); laboratory instruments and devices (two subjects); Balance Instrument - Electronic Balance parts and accessories (three subjects)