量程:0.0 to 3.0 pNa (23 to 0.023 g/L Na+), 解析度:0.1 pNa
量程:0.0 to 3.0 pNa (23 to 0.023 g/L Na+),解析度:0.1 pNa
量程:0 to 750mg/L CaCO3,精度:±7 mg/L 或读数的±3% (200 to 500 mg/L);