Barium sulphate is a white crystalline solid with the chemical formula BaSO4. It is very insoluble in water and other traditional solvents, but is soluble in concentrated sulfuric acid. The mineral barite is composed largely of barium sulfate and is a common ore of barium. Barium sulfate is used as a filler in plastics and as a component of oil well drilling fluid to increase the density. It is used in brake linings, acoustic foams and powder coatings. Barium sulfate is also used during the procedure of the soil pH test.

Barograph Charts are held on to the clock either by a clamp bar or a gummed, perforated removal strip. These charts are calibrated in inches of mercury (28″ / 31″) or in millibars (950mb/1050mb). These barograph charts are positively located by sprockets and cannot have a baseline drawn on them.

Barologger is known as levellogger with a small range of 1.5 m adequate to monitor the fluctuations that occur in barometric pressure. The barologger's readings are used to barometrically compensate levelogger readings. Typically, barologger readings range from 1 - 3.3 ft (30 - 100 cm) when the barologger is programmed with its operating altitude. Failure to input, the correct altitude with result in incorrect readings and may cause the pressure transducer to go out of range. It is strongly recommended that the altitude input be accurate to 10 m. When the barologger is programmed at its operating altitude, its readings can be used to directly compensate for barometric pressure, the readings of any levelogger programmed at the levelogger's operating altitude. As a rule or thumb, a barologger can be used to compensate all the leveloggers in a 20-mile (30 km) radius.

Barometric Compensated Draw-off Systems is a fully automatic hand off, draw-off system. It indicates true syrup draw-off temperatures. The true syrup draw-off temperature automatically changes with barometric pressure changes.