The Sper 850048 Combination Water Meter can Measure Dissolved Oxygen, pH, Conductivity, TDS, Salinityor TemperatureUsing DifferentProbes.

This kit includesincludes oneconductivity/salinity probe. Additionalprobes (optional) also allow it to operateasa highly accurate pH meter, conductivity meter, TDS meter, Salinity meter or DO meter as desired.
Probes change are easily changed and include specially designedguardsto prevent tip damage. This meteristhe ideal tool fornumerous professionalwater testing applications including: aquaculture, laboratories, swimming pools, spas and water treatment facilities.

• Large, backlit LCD can display multiple parameters including:pH, Conductivity, TDS, Salinity, Dissolved Oxygen, Temperature
  (using different probes)
• Displayed parameter isdetermined by probe type
• Green backlight for dark environment
• Fast measuring of Dissolved Oxygen value
• Accurate, replaceable probes withsafetycaps
• Auto ranging conductivity measurement
• Auto temperature compensation (ATC)
• 99 points memories w/recall function
• Multiple points calibration: 3 points for pH, 1 point for DO, 4 points for conductivity
• Manually altitude and salinity compensation function for DO measurement
• Availablereplacement probes
• Temperature unit ℃/℉ is switchable
• 1 hour auto power off