Application‑based segmentation isolates demand drivers by end‑use industry, reflecting distinct safety standards, operating pressures, and inspection frequencies. The oil & gas sector, accounting for roughly 35 % of the market, requires high‑pressure testing and frequent certification, driving robust sales of high‑capacity, fully automatic units. Petrochemical plants, representing about 25 %, prioritize corrosion‑resistant testers for aggressive media, favoring semi‑automatic models with advanced data analytics. Power generation, at 20 %, emphasizes reliability and downtime minimization, leading to adoption of portable testers for rapid on‑site verification. Water and wastewater treatment, contributing 12 %, relies on manual and semi‑automatic devices suited to moderate pressures and budget constraints. Manufacturing, the smallest slice at 8 %, typically employs bench‑mounted manual testers for routine maintenance. Collectively, these application segments shape the overall market size, with the oil & gas and petrochemical categories providing the bulk of revenue, while niche sectors add diversification to the Safety Relief Valve Testers market taxonomy.