Looking for economical flow meters? The GPI economy electronic digital flow meters are what you are looking for. These economy model flow meters are great for basic flow monitoring. GPI manufactures various economical flow meters that are good for measuring petroleum fuel, water, chemicals, harsh chemicals, engine oils, and transmission fluids. These economy flow meters come in various fitting and connection types such as NPT, BSPT, Schedule 80 Soc, ISO, and BSPP. Check individual flow meter models for their specific fitting type.