Ultrasound is more accurate than chalk when testing watertight doors in Tanker Shipping & Trade Magazine – 15 May 2018 .

WATCH: Accurate CO2 Cylinder Contents Measurement with Portalevel MAX PLUS and Portasteele® CALCULATOR
Watch the video demonstration of the Portalevel® MAX PLUS + Portasteele® CALCULATOR measuring the liquid level of a 45 KG / 100 lbs CO2 cylinder