The ERUN-ST7 multi-parameter water quality meter delivers accurate, simultaneous testing of pH, turbidity, conductivity, dissolved oxygen, nitrite, sulfate, and 20+ other critical water quality parameters—all in a single, CE-certified, ISO 9001-manufactured device.
Global aquaculture operations lose an estimated 15–20% of annual production to poor water quality management. The right testing equipment is not an expense—it is insurance against catastrophic losses. For fish farmers, hatchery operators, and shrimp pond managers, water quality isn't a lab report—it's a real-time decision-making tool that determines survival rates, feed conversion ratios, and ultimately, profitability.
Dissolved oxygen, pH, temperature, ammonia, nitrites, nitrates, and salinity are the seven parameters that every fish farming operation must monitor to prevent stock loss. A single parameter out of range can trigger a cascade of failures—low dissolved oxygen stresses fish, making them susceptible to disease; elevated nitrite causes brown blood disease; pH swings disrupt osmoregulation.
The global aquaculture water quality monitoring technologies market was valued at USD 1.6 billion in 2024 and is projected to reach USD 3.4 billion by 2031. This growth reflects an industry-wide shift from reactive problem-solving to proactive water quality management. Farmers are no longer asking whether to monitor—they are asking how to monitor more efficiently and cost-effectively.
Dissolved oxygen is the single most important water quality parameter in aquaculture—fish cannot survive below 3 mg/L for extended periods. Optimal DO levels range from 5–8 mg/L for most species. Below 3 mg/L, fish experience hypoxia; below 1 mg/L, mortality is imminent. The ERUN-ST7 measures DO with laboratory-grade accuracy, enabling early intervention before oxygen depletion causes losses.
pH affects every biological and chemical process in aquaculture water—the optimal range is 6.5–9.0 for most species. pH below 6.0 increases heavy metal toxicity; pH above 9.0 increases ammonia toxicity. The ERUN-ST7 delivers precise pH readings with ±0.01 resolution, allowing farmers to detect subtle shifts before they become critical.
Nitrite is toxic to fish even at low concentrations—the safe threshold is below 0.5 mg/L for most species. Nitrite binds to hemoglobin, preventing oxygen transport—a condition known as "brown blood disease." The ERUN-ST7 tests nitrite-nitrogen across a range of 0.02–5.0 mg/L with 5% accuracy, enabling farmers to detect rising nitrite levels before they reach dangerous thresholds.
Sulfate levels above 200 mg/L can cause diarrhea and poor growth in fish and shrimp. While less discussed than ammonia or nitrite, elevated sulfate indicates organic pollution or groundwater contamination. The ERUN-ST7 measures sulfate from 5–200 mg/L with 5% accuracy—a feature many competing meters lack.
Turbidity measures suspended particles that can clog fish gills and harbor pathogens. High turbidity reduces light penetration, disrupting natural food chains and stressing fish. The ERUN-ST7 quantifies turbidity objectively, removing the guesswork from visual inspection.
Conductivity indicates total dissolved solids—sudden changes signal contamination or salinity shifts. For freshwater aquaculture, conductivity should remain stable; spikes indicate pollution or saltwater intrusion. The ERUN-ST7 measures TDS alongside conductivity, providing a complete picture of water ionic balance.
The ERUN-ST7 is manufactured in an ISO 9001:2015 certified facility and holds CE and RoHS certifications, ensuring compliance with international health, safety, and environmental standards. CE certification confirms the meter meets EU safety requirements; RoHS certification guarantees the absence of hazardous substances. ISO 9001 certification reflects rigorous quality management throughout design, production, and testing.
The ERUN-ST7 tests over 20 parameters including ammonia nitrogen, total chlorine, free chlorine, permanganate index, iron, manganese, chromium (VI), chloride, nitrate-nitrogen, nitrite-nitrogen, fluoride, sulfate, aluminum, total hardness, total alkalinity, colority, turbidity, pH, water temperature, dissolved total solids, dissolved oxygen, arsenic, cadmium, copper, zinc, and lead. This eliminates the need for multiple single-parameter meters, reducing equipment costs and training requirements.
The ERUN-ST7 is built for the demanding conditions of fish farms, shrimp ponds, and hatcheries. Unlike laboratory instruments that require controlled environments, the ERUN-ST7 is portable, rugged, and user-friendly—designed for on-site testing by farm personnel with minimal training.
Parameter | Measurement Range | Unit | Accuracy |
|---|---|---|---|
Dissolved Oxygen | 0–20 | mg/L | ±0.5% |
pH | 0–14 | pH | ±0.01 |
Turbidity | 0–1000 | NTU | ±5% |
Nitrite-Nitrogen | 0.02–5.0 | mg/L | 5% |
Sulfate | 5–200 | mg/L | 5% |
Conductivity/TDS | 0–200,000 | μS/cm | ±1% |
Source: ERUN-ST7 product specifications
The ERUN-ST7 reduces testing costs by eliminating the need for multiple single-parameter instruments, specialized training for each device, and separate calibration schedules. One meter, one training session, one calibration protocol—complete water quality analysis in minutes.
When selecting a water quality meter for aquaculture, prioritize three factors: parameter coverage, certification, and total cost of ownership.
First, verify the meter tests all critical parameters for your species and system. For shrimp, prioritize pH, DO, salinity, and nitrite; for salmonids, add ammonia and temperature; for tilapia, conductivity and alkalinity matter more.
Second, check certifications. CE certification ensures the meter meets EU safety standards; RoHS certification confirms the absence of hazardous substances; ISO 9001 certification reflects manufacturing quality.
Third, calculate total cost—not just purchase price. Consider calibration frequency, reagent costs, probe replacement intervals, and after-sales support. The ERUN-ST7 offers low-maintenance operation with readily available consumables and responsive technical support.
Q: What parameters does the ERUN-ST7 test?
A: The ERUN-ST7 tests pH, turbidity, conductivity/TDS, dissolved oxygen, nitrite-nitrogen, sulfate, ammonia nitrogen, total chlorine, free chlorine, nitrate-nitrogen, fluoride, total hardness, total alkalinity, colority, water temperature, and multiple heavy metals including arsenic, cadmium, copper, zinc, and lead.
Q: Is the ERUN-ST7 certified for international export?
A: Yes. The ERUN-ST7 holds CE certification (EU safety standards), RoHS certification (hazardous substance compliance), and is manufactured in an ISO 9001:2015 certified facility.
Q: Can the ERUN-ST7 be used for both freshwater and saltwater aquaculture?
A: Yes. The ERUN-ST7 is suitable for both freshwater and saltwater applications.
Q: What is the accuracy of the ERUN-ST7?
A: Accuracy varies by parameter: pH ±0.01, dissolved oxygen ±0.5%, nitrite and sulfate 5%, conductivity ±1%.
Q: How long does it take to get results?
A: Most parameters yield results within seconds to minutes, making the ERUN-ST7 suitable for real-time on-site decision-making.
Don't let water quality issues cost you another harvest. The ERUN-ST7 puts laboratory-grade water quality testing in your hands—where and when you need it. With CE, RoHS, and ISO 9001 certifications, you're not just buying a meter; you're investing in peace of mind backed by international quality standards.
