A single CE, ISO 9001, and RoHS certified multi-parameter water quality tester can simultaneously measure pH, turbidity, conductivity, and residual chlorine—eliminating the need for multiple single-parameter devices and reducing equipment costs by over 60% while delivering lab-grade accuracy.
The global water quality analyzer market was valued at USD 4.5 billion in 2025 and is projected to reach USD 7.3 billion by 2035 at a CAGR of 5%. For drinking water producers, municipal suppliers, and export-oriented enterprises, a multi-parameter tester that measures pH, turbidity, conductivity, and residual chlorine is no longer a luxury—it is a compliance and safety necessity. The ERUN-ST7 drinking water multi-parameter tester from Winrun Environmental Protection integrates all four core parameters with CE, ISO 9001, and RoHS certifications, providing a reliable solution for global market access.
Drinking water safety cannot be assured by monitoring a single parameter—comprehensive multi-parameter testing is the industry standard.
The World Health Organization (WHO) Guidelines for Drinking-water Quality specify that pH should be between 6.5 and 8.5, turbidity below 5 NTU, and conductivity preferably under 400 μS/cm. China's national standard GB 5749-2022 similarly mandates monitoring of pH, turbidity, conductivity, and residual chlorine. A multi-parameter instrument can complete all these measurements in one run, significantly improving efficiency, reducing human error, and ensuring every batch of finished water meets international requirements.
pH, turbidity, conductivity, and residual chlorine are the “four pillars” of drinking water safety, each with clear international threshold values.
pH (Acidity/Alkalinity): Reflects the acid-base balance of water. WHO recommends 6.5–8.5. Too low a pH causes pipe corrosion; too high affects taste and may form disinfection by-products.
Turbidity: Measures suspended particles and directly indicates clarity. WHO requires <5 NTU; China's standard is stricter at ≤1 NTU. High turbidity not only looks unappealing but can also harbour pathogenic microorganisms.
Conductivity (EC): Indicates dissolved mineral content. WHO suggests <400 μS/cm; Chinese standards typically require below 500 μS/cm. Abnormally high EC may signal contamination or excessive minerals.
Residual Chlorine: Ensures ongoing disinfection during distribution. Both WHO and Chinese standards require ≥0.05 mg/L at network endpoints, with an ideal range of 0.2–1.0 mg/L.
CE, ISO 9001, and RoHS certifications are the three essential credentials that ensure water quality testing equipment meets international regulatory requirements and can be imported into EU, US, and other major markets without compliance barriers.
CE Certification: Confirms compliance with EU mandatory requirements for safety, health, and electromagnetic compatibility. Winrun's ERUN-S series successfully passed CE certification (Certificate No.: TRCN-25133XEE01), valid until 12 May 2030, complying with Low Voltage Directive (2014/35/EU) and Electromagnetic Compatibility Directive (2014/30/EU).
ISO 9001 Certification: Verifies that manufacturing processes adhere to internationally recognized quality management standards. ERUN's products are manufactured in ISO 9001:2015 certified facilities with rigorous process controls.
RoHS Compliance: Ensures the device is free from hazardous substances including lead, cadmium, and mercury, compliant with EU Directive 2011/65/EU and 2015/863/EU amendments.
These three certifications are essential for government agencies, laboratories, and water utilities when sourcing water quality instrumentation.
The ERUN-ST7 drinking water multi-parameter tester delivers lab-grade accuracy for pH, turbidity, conductivity, and residual chlorine—with CE, ISO 9001, and RoHS certifications that meet global export requirements.
The ERUN-ST7 integrates optical colorimetry and electrode detection in one benchtop unit, testing nearly 100 water quality parameters with a 5.7-inch touchscreen and 100,000-set data storage capacity.
Parameter | Measurement Range | Accuracy |
|---|---|---|
Residual Chlorine (low) | 0.02–2.00 mg/L | 0.1 or 5% |
Residual Chlorine (high) | 2.00–10.00 mg/L | 5% |
Total Chlorine (low) | 0.02–2.00 mg/L | 0.1 or 5% |
Total Chlorine (high) | 2.00–10.00 mg/L | 5% |
Ammonia Nitrogen (low) | 0.02–5.00 mg/L | 3% |
Ammonia Nitrogen (high) | 5.00–25.00 mg/L | 3% |
Source: ERUN-ST7 product specifications
The instrument covers physical indicators (pH, dissolved oxygen, conductivity, temperature, turbidity) and chemical pollutants (COD, ammonia nitrogen, residual chlorine, heavy metals, fluoride, sulfate). This eliminates the need for separate single-parameter devices, reducing equipment costs and lab space requirements.
Water utilities, government environmental monitoring stations, university research laboratories, and industrial quality control labs are the primary users of benchtop multi-parameter testers.
Municipal drinking water plants: Daily routine water quality compliance monitoring
Government environmental stations: Regional surface and tap water quality assessment
University labs: Teaching experiments and postgraduate water research
Bottled water factories: Finished water quality control
Industrial workshops: QC testing for pharmaceutical, chemical and power industries
The device supports Chinese and English bilingual interface switching to serve global overseas customers.
The global multi-parameter water quality testing market is expanding rapidly, with compound annual growth rates between 6.4% and 11.74%.
Market research indicates the global multi-parameter water quality tester market was valued at approximately USD 230 million in 2025 and is expected to reach USD 355 million by 2032. In 2025, the average selling price of water quality testing instruments was about USD 2,800 per unit, with global sales reaching roughly 2.15 million units. This growth is fuelled by increasingly stringent regulations on drinking water safety worldwide, as well as the expanding need for water quality monitoring in industrialising regions.
Q: Can one device really measure pH, turbidity, conductivity, and residual chlorine simultaneously?
A: Yes. The ERUN-ST7 integrates optical and electrode dual detection technology, allowing simultaneous measurement of all four core parameters plus dozens more indicators in a single run.
Q: What certifications does the ERUN-ST7 hold?
A: The ERUN-ST7 holds CE certification (Certificate No.: TRCN-25133XEE01), ISO 9001:2015 certification, and RoHS compliance—making it ready for export to EU, North America, and other regulated markets.
Q: What is the accuracy of residual chlorine measurement?
A: Residual chlorine measurement accuracy is 0.1 or 5% across both low range (0.02–2.00 mg/L) and high range (2.00–10.00 mg/L).
Q: Who typically uses this type of instrument?
A: Municipal water plants, government environmental agencies, university research labs, bottled water manufacturers, and industrial quality control departments.
Erun Environmental Protection—your trusted partner in water quality testing solutions, delivering CE, ISO 9001, and RoHS certified instrumentation for global drinking water safety monitoring.
