Manometric measurement is the subject of pressure head calculations. The Bravo pH capsule is placed either transnasally based on manometric measurements, or following endoscopy. These "manometric units" are still encountered in many fields. In physiology manometric units are used to measure Starling forces. The Koinge manometric flame apparatus Jim & Rhoda Morris at SciTechAntiques. Both telescoping types use the manometric property of water to provide a seal. Although no longer preferred, these manometric units are still encountered in many fields. Strength training may involve electromyography (EMG) skin electrodes, manometric pressures, intra-anal EMG, or endoanal ultrasound.