| Measurement Parameters | Dissolved oxygen (%, ppm, mg/L) and temperature |
| DO Range | 0.0–199.9% (0.00–19.99 ppm) |
| DO Resolution | 0.1% / 0.01 ppm |
| DO Accuracy | ±1.5% F.S. |
| Temperature Range | 0–50°C (32–122°F) |
| Temperature Accuracy | ±0.3°C |
| Temperature Resolution | 0.1°C |
| Temperature Compensation | Automatic |
| Salinity Compensation | 0.0–50.0 ppt, 0.1 ppt resolution (manual) |
| Barometric Pressure Compensation | 500–1499 mmHg / 66.6–199.9 kPa (manual) |
| Membrane Coefficient | Adjustable |
| Calibration | 100% DO calibration |
| Electrode Type | Clark-type DO electrode |
| Sensor Life | Over 6 months with good maintenance |
| Probe Cable Length | 333 cm |
| Display | Large LCD showing DO and temperature, with stability indicator |
| Operating Conditions | 0–50°C, humidity below 80% |
| Storage Conditions | 0–60°C, humidity below 90% |
| Data Memory | 99 points with real-time clock stamp |
| Data Output | IrDA port for wireless printing; RS232 PC connection optional |
| Other Functions | Data hold, low-battery indicator |
| Auto Power-Off | Selectable: 20/30/40/60/90/120 min |
| Power Supply | 4 × AAA batteries |
| Meter Dimensions | 175 × 70 × 33 mm |
| Meter Weight | About 150 g (without batteries) |
Portable Dissolved Oxygen Meter ADPOM-504 is used for water quality testing in aquaculture such as fish and shrimp farming, in environmental testing including BOD analysis, and in laboratories and teaching institutions. It gives quick DO and temperature checks both in the field and at the bench.
| Dissolved Oxygen Measuring Range | 0 to 20mg/L；0 to 200% |
| Resolution Ratio | 0.01mg/L；0.1% |
| Measurement Accuracy | 0.05mg/L;0.5% |
| Dissolved Oxygen Measuring Range | 0 to 20 mg/L |
| Saturation Measuring Range | 0 to 200% |
| Temperature Measuring Range | 0 to 50℃ |
| Dissolved Oxygen Concentration Measuring Range | 0 to 20 mg/L |
| Dissolved Oxygen Concentration Resolution | 0.01 mg/L |
| Dissolved Oxygen Concentration Accuracy | ≤±0.30 mg/L |
| COD Range: | 0 to 10000 mg/L (Customized) |
| Principle: | UV 254 |
| Resolution: | 0.01 mg/L |
| COD Test Method: | Potassium dichromate method<br/>Alkaline potassium permanganate |
| COD Measuring Range: | 10 to 15000mg/L<br/>0.5 to 25mg/L |
| COD Test Limit: | 10mg/L<br/>0.5mg/L |
.webp "Multi Parameter Water Quality Analyzer ADMWA-504")
| Absorbance Detection Range: | 0 to 3Abs |
| Optical Path Stability: | ≤±0.005Abs/30min |
| Absorbance Resolution: | 0.001Abs |
| Indication Error: | ≤±5% |
| Repeatability: | 0.03 |
| COD Detection Method: | Potassium dichromate method, Potassium permanganate method |
| COD Detection Method: | Potassium dichromate method<br/> Potassium permanganate method |
| COD Measuring Range: | 10 to 15000 mg/L |
| COD Lower Limit of Measurement: | 3 mg/L |
| Test Parameter: | Ammonia nitrogen |
| Measuring Range: | 0.01 to 10mg/L |
| Wavelength: | 420 nm |
| Test Parameter: | Residual Chlorine |
| Measuring Range: | 0.05 to 10 mg/L |
| Wavelength: | 520 nm |
| Test Parameter: | Ozone |
| Measuring Range: | 0.05 to 2.5mg/L |
| Wavelength: | 520 nm |
| Test Parameter: | Total Chlorine |
| Measuring Range: | 0.05 to 10 mg/L |
| Wavelength: | 520 nm |
| Test Parameter: | Chlorine dioxide |
| Measuring Range: | 0.1 to 5 mg/L |
| Wavelength: | 520 nm |
| Measuring Range: | 0 to 1000 NTU (Selectable ranges: 0 to 20 NTU, 0 to 200 NTU, 0 to 1000 NTU) |
| Accuracy: | ±0.1NTU or ±5%<br/> ±0.3NTU or ±8% |
| Repeatability: | ≤±0.1NTU at＜10NTU<br/> ≤±1% at ≥10NTU |
| TSS Measuring Range: | 0 to 1000mg/L |
| TSS Accuracy: | ±0.3mg/L or ±8% |
| TSS Repeatability: | <10mg/L: ≤±0.1mg/L <br/>≥10mg/L: ≤±1% |
| TSS Measuring Range: | 0.1 to 50000 mg/L |
| TSS Accuracy: | ± 5% FS (depending on the homogeneity of the activated sludge) |
| TSS Repeatability: | <1% |
| TDS Range: | 0 to 9999 ppm |
| Conductivity Range: | 0 to 9999 μS/cm |
| Temperature Range: | 0 to 80℃ or 32 to 176℃ |
| Measuring Range: | 0 to 10% |
| Measuring Temperature Range: | 0 to 99℃ |
| Resolution: | 0.01%，0.1℃ |
.webp "Thermoreactor ADTR-502")
| Temperature Control Range: | 45 to 180℃ |
| Digestion Temperature: | 45 to 180℃ |
| Temperature Control Accuracy: | ±0.1℃ |
| Temperature Control Range: | Room temperature to 180℃ |
| Digestion Temperature Range: | 50 to 180℃ |
| Temperature Control Accuracy: | ±0.1℃ |
| pH Measuring Range: | -2 to 16 pH |
| pH resolution: | 0.1pH |
| pH indication error: | ±0.2% F.S. |
.webp "ORP Meter ADOR-501")
| ORP Measuring Range: | -1000mV to 1000mV |
| ORP Resolution: | 1 mV |
| ORP measurement Accuracy: | ±0.5% F.S. |
| pH Measuring Range: | 0 to 14pH |
| pH Resolution: | 0.01pH |
| pH Measuring Accuracy: | ±0.01pH |
| pH Measuring Range: | 0 to 14 pH |
| pH Resolution: | 0.041 pH |
| pH Indication Error: | ±0.02 pH |