The ERUN-ST7 benchtop multi-parameter drinking water tester is a CE, ISO 9001, and RoHS certified instrument that simultaneously measures pH, turbidity, conductivity, residual chlorine, and 80+ additional water quality parameters with lab-grade accuracy—making it the ideal solution for water supply system quality monitoring and regulatory compliance.
Drinking water quality directly impacts public health, and multi-parameter testing is the only way to ensure comprehensive safety monitoring. The global water testing market was valued at USD 4.83 billion in 2026 and is projected to reach USD 6.26 billion by 2031, growing at a 5.32% CAGR.This growth reflects increasing regulatory pressure and rising public demand for safe drinking water worldwide.
Municipal water utilities, food processing facilities, and environmental monitoring agencies all require reliable, multi-parameter testing to verify that water meets WHO and EPA standards. The WHO recommends free chlorine levels between 0.2 and 5 mg/L for effective disinfection, while the US EPA sets a maximum residual disinfectant level of 4 mg/L.pH must fall within the 6.5–8.5 range, and turbidity should not exceed 5 NTU.
A comprehensive drinking water tester must measure at minimum four core parameters: pH, turbidity, conductivity, and residual chlorine.
pH (6.5–8.5 range): pH indicates the acidity or alkalinity of water. Water outside the 6.5–8.5 range can corrode pipes, leach heavy metals, and cause skin irritation. WHO and EPA both mandate this range for drinking water.
Turbidity (≤5 NTU): Turbidity measures water clarity. High turbidity can harbor pathogens and interfere with disinfection. WHO guidelines set the limit at 5 NTU.
Conductivity (TDS indicator): Conductivity reflects dissolved solids. While WHO sets a guideline of 1,000 mg/L for TDS, elevated conductivity can indicate contamination from agricultural runoff or industrial discharge.
Residual Chlorine (0.2–5 mg/L): Free chlorine ensures ongoing disinfection in distribution systems. WHO recommends 0.2–5 mg/L; EPA sets a maximum of 4 mg/L.
CE, ISO 9001, and RoHS certifications are mandatory credentials for exporting drinking water testing equipment to regulated markets.
CE Marking confirms the instrument meets EU safety, health, and electromagnetic compatibility (EMC) requirements under the Low Voltage Directive (LVD) and EMC Directive.
ISO 9001 certifies that the manufacturer follows internationally recognized quality management systems, ensuring consistent product quality and reliable after-sales support.
RoHS Compliance verifies the product is free from hazardous substances including lead, mercury, cadmium, and hexavalent chromium, making it environmentally safe and compliant with the EU RoHS Directive (2011/65/EU).
Without these certifications, instruments may be rejected at EU borders or fail to meet procurement requirements for government and institutional buyers.
The ERUN-ST7 integrates optical and electrode methods to measure over 80 water quality parameters in a single benchtop unit.
Key specifications include:
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% |
pH | Standard range | Lab-grade |
Turbidity | 0.00–500.00 FTU | ≤2% (F.S.) |
Ammonia Nitrogen (low) | 0.02–5.00 mg/L | 3% (F.S.) |
COD (low range) | 5–200 mg/L | 5% |
Nitrate-N | 0.02–10.0 mg/L | 0.1 or 5% |
The ERUN-ST7 supports parameters including total hardness, total alkalinity, colority, dissolved oxygen, TDS, iron, manganese, chromium (VI), chloride, fluoride, sulfate, aluminum, arsenic, cadmium, copper, zinc, lead, and many more.
This benchtop analyzer is designed for intelligent laboratory water quality monitoring and meets water supply system quality indicator testing standards.
When selecting a drinking water multi-parameter tester, prioritize certified instruments that cover your required parameters, offer reagent-free operation where possible, and provide reliable accuracy.
Step 1: Verify certifications. Ensure the instrument holds CE, ISO 9001, and RoHS certifications—non-negotiable for export and institutional procurement.
Step 2: Match parameters to your application. Municipal drinking water requires at minimum pH, turbidity, conductivity, and residual chlorine. Surface water monitoring may require additional parameters like COD, ammonia, and heavy metals.
Step 3: Evaluate total cost of ownership. Choose instruments that minimize recurring reagent costs and offer durable, low-maintenance design.
Step 4: Confirm accuracy and range. Verify that the instrument’s measurement ranges and accuracy meet your regulatory requirements.
Multi-parameter drinking water testers are essential across municipal water supply, food processing, environmental monitoring, and industrial compliance applications.
Municipal water utilities: Monitor source water, treatment plant output, and distribution system quality
Food and beverage processing: Verify incoming water quality and final product safety
Environmental monitoring: Assess surface water, groundwater, and recreational water bodies
Industrial compliance: Ensure wastewater discharge meets regulatory limits
Emergency response: Rapidly assess water quality during contamination events
Q: What parameters should a drinking water tester measure?
A: At minimum, pH, turbidity, conductivity, and residual chlorine. WHO and EPA standards require these core parameters for drinking water safety compliance.
Q: Why are CE, ISO 9001, and RoHS certifications important?
A: These certifications are mandatory for exporting to EU and regulated markets, ensuring product safety, quality management, and environmental compliance.
Q: What is the WHO guideline for residual chlorine in drinking water?
A: WHO recommends free chlorine between 0.2 and 5 mg/L for effective disinfection while minimizing harmful by-products.
Q: Can one instrument measure multiple parameters simultaneously?
A: Yes. The ERUN-ST7 benchtop multi-parameter tester measures pH, turbidity, conductivity, residual chlorine, and 80+ additional parameters in a single unit.
Q: What is the global market outlook for water testing equipment?
A: The water testing market is projected to grow from USD 4.83 billion in 2026 to USD 6.26 billion by 2031 at a 5.32% CAGR.
For drinking water quality monitoring that meets international standards, the ERUN-ST7 benchtop multi-parameter tester delivers CE, ISO 9001, and RoHS certified performance across pH, turbidity, conductivity, residual chlorine, and 80+ additional parameters. With the global water testing market expanding at 5.32% CAGR through 2031, investing in certified, multi-parameter testing equipment ensures regulatory compliance, public health protection, and operational efficiency.
Xi'an Erun Environmental Protection Technology Group Co., Ltd. (赢润环保) is a high-tech enterprise with registered capital of RMB 51.8 million, dedicated to R&D, production, and innovation in precision scientific instruments for water and gas analysis—empowering global water quality monitoring with certified, intelligent solutions.
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