Dissolved Oxygen Tracer Code: 1761 Oxygen displayed as % Saturation from 0 to 200.0% or concentration from 0 to 20.00ppm (mg/L)		pH Tracer Code: 1741 Waterproof pH and Temperature meter.
		EC/TDS/SALT Tracer Code: 1749 Offers direct reading of Conductivity, Total Dissolved Solids, Salinity and Temperature with one electrode.		ORP Tracer Code: 1742 Waterproof ORP meter.
		Total Chlorine Tracer Code: 1740 Waterproof Total Chlorine and Temperature meter.		Conductivity & Total Dissolved Solids Testers Codes: ECTestHigh ECTestLow TDSTestr high TDSTestr low
		pH Meter Code: pHTestr2 Waterproof. Replaceable electrode. Push button 3 point calibration.