QIUSUO Ammonium Ion Meter NH4 Ion Concentration Meter with Standard Calibration Fluid Range 0.1 to 18000 ppm Accuracy ±1% F.S. for Testing NH3 Ion

QIUSUO Chlorine Ion Meter with Calibration Fluid Range 1 to 35000 ppm 2 to 5 Points Calibration Accuracy ±0.5% F.S.