Plastic Circular Vial Spirit Bubble Level Rv bubble level for Camera tripods, &Oslash;15x8mm, Clear&Green, 30&prime;/2mm, 4 Pics Acrylic housing, high clarity scratch free PMMA White backing .Yellow (2 pieces )/Green(2 pieces) liquid Sensitivity 34' per 2mm bubble movement Highest quality plastic vial Applications:Camera tripods.Weighing scales.Compass levelling