YSI Pro Plus Water Quality Instrument Rental Measures pH, dissolved oxygen (DO), conductivity, resistivity, salinity, total dissolved solids (TDS), temperature, barometric pressure, and oxidation reduction potential (ORP).Includes flow-through cell for low flow sampling measurements.Fits into 2" diameter wells and larger.1 meter (3 feet) 4 meter (13 feet) and 30 meter (98 feet) cable lengths available. $119 View Details Quote Request