Precision Mini Acrylic Bubble Level Vials. Tight tolerance cylindrical bodies have barrel-shaped interiors. This patented design allows you to mount the vial in any orientation along the 360° axis with equally accurate readings. Vials have long lasting, hot-stamped markings and fluorescent yellow fluid for high visibility. 1" Long x 3/8" Diameter. Sensitivity 0.20 in./ft. 60 min.0.1"