pH, Conductivity, TDS, Salinity meter
"The Extech EXSTIK II waterproof meter has a rugged combination, flat-surface pH electrode [with auto-ranging], high-accuracy cell. RENEW feature alerts users when the electrode needs replacing. Adjustable conductivity to TDS ration from .4 to 1.0 and .5 fixed salinity ratio. Meter also has ATC, auto shut-off and low battery indication. The internal memory stores up to 25 labeled readings for recall.
CONDUCTIVITY: range: 0-1,999 μS/cm - resolution: 0.1 μS/cm
TDS/SALINITY: range: 0-9.99 ppt - resolution: 0.1 ppm (mg/L)
pH: range: 0-14 - resolution: 0.01"