Wholesale TDS and EC Meter Wholesaler & Factory

BOQU is an authentic primary manufacturer founded in 2007 in Shanghai, China. We operate two modern production facilities totaling 4,632 m² in Pudong New Area (Kangqiao) and the Lingang Industrial Zone. R&D, PCB assembly, glass blowing, sensor calibration, and full instrument assembly are conducted directly in-house by our team of 200+ employees.

2-electrode contact sensors (with cell constants K=0.01 to 0.1) are ideal for pure and ultrapure water monitoring below 200 μS/cm where polarization error is negligible. 4-electrode designs use alternating inner sensing electrodes to cancel polarization resistance, extending measurement range up to moderate salinity. Electrodeless (toroidal) sensors measure induced magnetic flux, making them immune to chemical coating, biological fouling, and electrode corrosion in harsh wastewater, brine, and chemical processing lines.

We provide end-to-end OEM and ODM services for global instrumentation brands, distributors, and large engineering contractors. This includes customized silkscreen branding, private labeled firmware and UI software, specialized enclosure materials (PVDF, 316L, Titanium, PEEK), application-specific cable types and lengths, tailored cell constants, and custom RS485 Modbus register maps.

Our manufacturing operations are strictly audited and certified under ISO 9001:2015 Quality Management Systems and ISO 14001:2015 Environmental Systems. Our products carry European Conformity (CE) marking, SGS audit verification, and FDA compliance reports where relevant. Additionally, our flagship pH5806 high-temperature sensor has received the Shanghai Brand certification for technological innovation and reliability.

Yes. Sensors specifically engineered for bioprocessing and pharmaceutical fermentation, including models such as pH5806 and DOG-208FA, are constructed with specialized high-temperature glass formulations, polymeric reference junctions, and pressurized reference chambers. They are built to withstand repeated clean-in-place (CIP) and steam-in-place (SIP) cycles up to 130°C without significant baseline drift or diaphragm rupture.

To provide the most accurate model selection and competitive quote, please provide: water or chemical matrix type, anticipated measurement range (EC, TDS, pH, DO, etc.), operating process temperature and line pressure, mounting configuration (immersion, inline flow-through, or pipeline retractable), preferred telemetry output (RS485 Modbus RTU, 4-20mA, HART, or wireless), and available power supply.