Measurement method:
+ pH: Glass electrode
+ Turbidity: 90 °C light scattering 
+ Conductivity: AC 4 electrode
+ Salinity: Conversion from Conductivity
+ DO (optional): Membrane type polarographic  
+ Temperature: Thermistor resistor

Display: LCD

Measurement range:
+ pH: 0.00 ~ 14.00
+Turbidity:
- 0.0 ~ 80.0 NTU (mg/L)
- 0 ~ 800 NTU (mg/L)
Range switch: Automatic / Manual 

+ Conductivity: 0.0 mS / m ~ 100 S / m
                         Range switch: Automatic / Manual 
+ Salinity: 0.00 ~ 4.04% (NaCl) /0.00~40.40 (PSS)
+ DO (optional): 0 ~ 20.00 mg/L - 0 ~ 200%
+ Temperature: 0.0 ~ 50 °C

Display range:
+ pH: -2000 ~ 16,000
+ Turbidity:
- 0.0 ~ 88.0 NTU (mg/L)
- 0 ~ 880 NTU (mg/L) 
+ Conductivity:
0.0 ~ 202.0 mS/m
0.000 ~ 2.020 S/m
0.00 ~ 20.20 S/m 
+ Salinity:
0.00 ~ 4.04% (NaCl)
0.00 ~ 40.40 (PSS: salinity)
+ DO (optional): 0.00 ~ 22.00mg / L - 0 ~ 220%
+ Temperature: -5.0 ~ 110.0 °C

Repeatablity:
+ pH: within ± 0.05pH
+ Turbidity: within ± 1% FS, within ± 0.8 NTU (0.0-80.0NTU), within 8NTU (0-800NTU)
+ Conductivity: within ± 1% (FS) each range
+ Salinity: within ± 0.04% (NaCl)/within ±0.42 PSS
+ DO (optional): within ±0.1 mg/L - ± 2% 
+ Temperature: within ± 0.5 ℃

Sensor depth: Within 30m (0.3MPa equivalent)
External output: RS-232C(Non-insulated): PC or external printer EPS-P30 (optional)
Water proof (Main unit): IP67 - Can immerse in 1m and 30 minutes under water
Guaranteed temperature: 0 ~ 45 ℃ (0 ~ 40 ° C when using optional AC adapter or external printer)
Power source: AA battery/Nickel hydrogen battery (2) or AC adapter (7VA optional)
Dimensions Body: Approx. 68 W × 35 H × 173 D mm - Sensor module: Approx. ø55x476mm
Weight: Main unit: Approx. 290g (including batteries)
               Sensor modudle (Cable length 2m): Approx. 1400 g 

This product is used to measure pH, conductivity, turbidity, salinity, DO, temperature in rivers, lakes, dams, factories, buildings.