Housings of the vial : The main housing of the bubble shall be made from square tubing of Aluminium extrusion as per IS: 733 -83, Design-HE 9 or HE 30.The initial circular housing (Mounts ) of the vial shall be made of Aluminium alloy as per IS: 737-86 (Grade-1C).
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Base length: 200 mm + 1 mmBase width : 20 mm + 0 - 1Height: 25 + 1 mmBubble opening : 50 mm x 8 mm (length x width) Sensitivity : 2 Min. 30 Sec per 2 mm arc division of the vialLeast count of graduation : 2 mmEffective length of bubble : 20 + 1 mm
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