The Bi-Directional Flowmeter segmentation by type distinguishes six core technologies: turbine, ultrasonic, electromagnetic, Coriolis, thermal and differential‑pressure. Turbine meters, employing a rotor driven by fluid motion, dominate the low‑cost segment and contribute roughly 22 % of total revenue due to widespread use in water distribution and HVAC systems. Ultrasonic meters, which measure transit‑time differences of acoustic signals, account for about 18 % of the market; their non‑intrusive design makes them preferable in corrosive or high‑purity streams. Electromagnetic flowmeters, relying on Faraday’s law, capture 20 % of sales, driven by strong demand in wastewater treatment where conductive liquids are common. Coriolis meters provide direct mass‑flow measurement and represent the highest‑value tier, contributing 25 % of market size because of their accuracy in oil‑and‑gas and process industries. Thermal meters, based on heat‑transfer principles, hold a 9 % share, primarily in low‑flow residential applications. Differential‑pressure meters, using pressure‑drop across an obstruction, complete the landscape with a 6 % share, largely in steam and gas pipelines.