pH Range: (-2.000 ~ 19.999) pH
Ion Concentration: 0.00 ~ 14.00 pX
Conductivity range: Conductivity: (0.00~20.00)μS/cm (20.0~200.0)μS/cm
(200~2000)μS/cm (2.00~20.00)mS/cm
(20.0~200.0)mS/cm (200~2000)mS/cm(K=10)

Conductivity: (0.00~20.00)μS/cm (20.0~200.0)μS/cm (200~2000)μS/cm 
(2.00~20.00)mS/cm (20.0~200.0)mS/cm (200~2000)mS/cm(K=10)
Resistivity: (0 ~ 100)MΩ·cm  TDS: (0 ~ 100)g/L Salinity: (0 ~ 100)ppt
DO Range: (0 ~ 19.99)mg/L(ppm) (0 ~ 200.0)%

pH Range: (-2.000 ~ 19.999) pH
mV Range: -1999.9mV ~0 ~1999.9mV
DO Range: (0 ~ 20.00)mg/L(ppm) (0 ~ 200.0)%
Temp. Range: -10°C ~110°C

pH Range: (-2.000 ~ 19.999) pH
Conductivity: (0.00~20.00)μS/cm (20.0~200.0)μS/cm (200~2000)μS/cm 
(2.00~20.00)mS/cm (20.0~200.0)mS/cm (200~2000)mS/cm(K=10)
Resistivity: (0 ~ 100)MΩ·cm    TDS: (0 ~ 100)g/L

pH Range: (-1.99 ~ 19.99) pH
Conductivity: （0 ~ 2×105）μS/cm, devided into 5 range;
(0.00~20.00)μS/cm (20.0~200.0)μS/cm (200~2000)μS/cm 
(2.00~20.00)mS/cm (20.0~200.0)mS/cm
Resistivity: (0 ~ 100)MΩ·cm  TDS: (0 ~ 100)g/L

Fluoride Ion range：Meter：(0.00 to 9.00) pF，connect meter with electrode：(1.00 to 6.00) pF mV range: -1999.9 mV to 0 to 1999.9mV Temperature range: -10℃ to 110℃

Sodium Ion range：Meter: (0.00 to 9.00) pNa, connect meter with electrode: (1.00 to 7.00) pNa mV range: -1999.9 mV to 0 to 1999.9mV Temperature range: -10℃ to 110℃

DO Range: (0 ~ 19.99)mg/L(ppm) (0 ~ 200.0)%
DO Accuracy: Meter: ±0.10 mg/L, connect meter with electrode: ±0.40 mg/L
Temperature range:  0~45℃
Data storage：600 groups

Conductivity: 0-2000 mS/cm, divided into 6 ranges:
(0-19.99) μS/cm, (20.0~199,9) μS/cm,(200-1999) μS/cm, 
(2.00-19.99) mS/cm, (20.0~199.9) mS/cm, (200~2000)mS/cm (K=10)
TDS: (0-100) g/L   Salinity: 0-100 ppt

Conductivity: 0-2000 mS/cm, divided into 6 ranges:
(0-19.99) μS/cm, (20.0~199,9) μS/cm,(200-1999) μS/cm, 
(2.00-19.99) mS/cm, (20.0~199.9) mS/cm, (200~2000)mS/cm (K=10)
TDS: (0-100) g/L   Salinity: 0-100 ppt

Conductivity: 0-2000 mS/cm, divided into 6 ranges:
(0-19.99) μS/cm, (20.0~199,9) μS/cm,(200-1999) μS/cm, 
(2.00-19.99) mS/cm, (20.0~199.9) mS/cm, (200~2000)mS/cm (K=10)
TDS: (0-100) g/L   Salinity: 0-100 ppt

Conductivity: 0-200.0 mS/cm, divided into 5 ranges:
(0-19.99) μS/cm, (20.0~199,9) μS/cm, (200-1999) μS/cm,
(2.00-19.99) mS/cm, (20.0~200) mS/cm
TDS: (0-100) g/L     Salinity: 0-100 ppt