All models have flexible vinyl-plastic columns and flexible spring steel scale calibrated in inches of water using water and inches of mercury using mercury
Scale is centre-mounted between columns to eliminate parallax error and has a full 2-inch sliding zero adjustment
All models feature exclusive moulded nylon tubing connector assemblies with rapid shutoff design and an acrylic plastic top
Moulded all-nylon construction makes this assembly corrosion-proof, leakproof and practically unbreakable
All models have over pressure safety traps in the top of both columns to prevent loss of fluid due to over range pressures or surges in pressure
