Hioki Electrical Test & Measuring Instruments

HIOKI E.E. CORPORATION is a Japanese maker of electrical test and measuring instruments, founded in June 1935 and headquartered in Ueda, Nagano, and listed on the Tokyo Stock Exchange Prime market. It develops, manufactures, sells and services instruments that help manufacturers, utilities and maintenance teams measure power, resistance, insulation and signals accurately in EV, battery, energy and electronics applications.

The portfolio spans power meters and power analyzers, power quality analyzers, LCR meters and impedance analyzers, resistance meters and battery testers, electrical safety and hipot testers, data loggers and memory recorders, current probes, and field testers such as clamp meters, insulation testers and multimeters. It also offers bare board and package testers and GENNECT Space, a measurement data hub. Hioki Singapore acts as regional headquarters for Southeast Asia, and a Vietnam subsidiary was set up in Hanoi in 2025.

• Power analyzers: power meters, power analyzers and power quality analyzers for motors, inverters and grids.
• LCR and resistance: LCR meters, impedance analyzers, resistance meters and battery testers.
• Safety testing: hipot, insulation and leakage testers, including the ST5680A for EV batteries.
• Data acquisition: memory recorders, multichannel data loggers and thermistor modules.
• Current probes: high-frequency, high-current probes up to 2000 A for EV evaluation.
• GENNECT Space: measurement data hub for post-measurement data workflows.

An EV or battery pack plant in Vietnam can use resistance meters and DC hipot testers for weld and insulation checks. An electronics component maker can sort chip resistors at high speed on the production line. A factory energy team can audit power quality and consumption with power loggers and analyzers.

Manufacturers get one supplier for lab, production-line and field measurements across EV, battery, motor and electronics testing. Nanohm-level resistance meters and DC hipot testers support quality control of busbar welds and EV battery packs. The Hanoi subsidiary provides local sales, customer support and after-sales service in Vietnam. Calibration services in the region are accredited to ISO/IEC 17025.

Electrification of vehicles, batteries and renewable energy is raising demand for accurate power, resistance and insulation measurements in R&D and on production lines. Hioki itself cites Vietnam's decarbonisation push and accelerating foreign investment as reasons for opening a local subsidiary, as electronics, EV and energy manufacturing grows in the country.

Founded June 1935, incorporated January 1952; headquarters at 81 Koizumi, Ueda, Nagano, Japan; listed on Tokyo Stock Exchange Prime (6866); 1,153 group employees at end-2025. HIOKI ELECTRIC VIETNAM COMPANY LIMITED (Hanoi) was established in March 2025 as a wholly owned subsidiary. Three products won 2026 Good Design Awards.