The YSI Professional Plus handheld has been discontinued as of March 31, 2021. The direct replacement is the ProQuatro multiparameter handheld. See the FAQ tab below or visit the ProQuatro page for more information.

The Pro Plus multiparameter meter provides extreme flexibility for the measurement of a variety of combinations for dissolved oxygen, conductivity, specific conductance, salinity, resistivity, total dissolved solids (TDS), pH, ORP, pH/ORP combination, ammonium (ammonia), nitrate, chloride and temperature. Also a very powerful lab instrument for BODs, pH and ORP.

Smart Features Include:

• 5,000 data set memory
• Detailed on-screen Help function*
• Free, Data Manager desktop software and ProComm II saddle*
• Interval or single-event logging
• 100 folder & site list data structure*
• Password protection
• Detailed GLP data
• USB connection also powers the instrument
• 6-point cal with auto-buffer recognition*
• User-adjustable auto-stable with prompts*
• User-upgradeable software via waterproof USB port
• Recalibration prompts
• Search function filters user-defined data information*
• Backlit display AND keypad*
• Cable management kit included with all cables from 4- to 30-meters*