ProQuatro YSI ProQuatro Product Details The ProQuatro handheld multiparameter meter measures a variety of combinations of dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Brouchure Enquire Now Product Specifications Brand YSI (A xylem brand) Size 475 grams (1.05 lbs.) USB Port Built-in… Continue reading ProQuatro