1、General 5 parameters of surface water：
(1) Temperature
Temperature fluctuations in surface water, especially non-seasonal abnormal changes, often have serious impacts on animals and plants in the ecological environment, and in extreme cases can lead to massive deaths. The GB 13195 thermometer method is mainly used for measurement.
(2)PH
The pH value of water quality is one of the key indicators. In surface waters, changes in pH affect animal feeding and algae's absorption of oxygen. The GB 6920 glass electrode method is usually used to measure pH value.
(3) Dissolved oxygen
Dissolved oxygen in water not only provides respiration for organisms, but is also used by oxygen-consuming microorganisms and is consumed by reducing substances such as sulfite ions, nitrite ions, and sulfides. It is the key to judging the self-purification ability of water quality, and is mainly measured by the GB 11913 electrochemical probe method.
(4) Turbidity
Turbidity reflects the cloudiness of water and is primarily caused by insoluble solids. Reducing turbidity helps reduce corrosives, bacteria, phytoplankton, and coliforms. The formazine turbidity method is currently widely used for determination.
(5) Conductivity
Conductivity not only shows the conductivity of water, but also indirectly reflects information such as total dissolved solids (TDS), salinity, and total ion concentration in the solution. The current mainstream measurement method is the electrode method.
2、Technical parameters of conventional five-parameter tester for surface water：
| Serial No. | Items | Measuring range | Unit | Maximum deviation |
| 1 | Turbidity | 0-400 | NTU | ≤2%(F.S) |
| 2 | PH | 0.00-14.00 | PH | ±0.2 |
| 3 | Dissolved oxygen | 0.1-10.0 | mg/L | 0.1±5% |
| 4 | Conductivity | 0.00µs/cm-199.9ms/cm | ms/cm | 1.0% (F.S) |
| 5 | Temperature | -50-120 | ℃ | ±0.1 |
More parameters that need to be tested can be customized according to requirements.
Testing method: Sampling test
Display mode: 5.0-inch Chinese and English LCD display
Data storage: can store 100 curves and 1999 data with time and parameter labels
Data transmission: peripheral USB interface, supports data management and instrument control
Optical path system: using solid-state light-emitting devices as both light sources and monochromators, cold light sources, and narrow-band interference optical systems
Light source life: The light source has a service life of 100,000 hours
Detection method: Electrode method & visible light spectrophotometry
Accuracy error: ≤5%F.S. (subject to specific parameters)
Power supply mode: AC 220V, built-in large-capacity rechargeable battery
Product size: 410mm×300mm×130mm
Product weight: 4kg
3、Configuration list of conventional five-parameter tester for surface water：
(1) 1 portable multi-parameter water quality analyzer
(2) 2 cuvettes
(3) 1 lens hood
(4) 1 temperature electrode
(5) 1 pH electrode
(6) 1 dissolved oxygen electrode
(7) 1 conductivity electrode
(8) USB cable and 1 charging power supply
(9) 1 instruction manual
(10) 1 product certificate and warranty card
