3 meters in 1! These meters allow you to measure pH, EC (conductivity) and TDS with just one instrument and one single probe! The SM802, with a conductivity range that goes up to 6.00 mS/cm and the TDS up to 4000ppm is ideal for testing in crop production. SOil and well water pH that is too acidic or alkaline can have an adverse effect on plant nutrient and water uptake and directly effect the efficiency of fertilizer, herbicides and pesticides. Soil conductivity is checked before fertilizer application to pinpoint field needs and after fertilization to establish its effectiveness. Supplied with teh MA850 interchangeable probe to measure pH, Conductivity and TDS. The pH electrode utilizes a fiber junction to reduce contamination when measuring fertilizer solutions. Both meters calibrate manually in pH, Conductivity and TDS. SMART pH/EC/TDS COMBINED METER , RANGE: 0.00 – 14.00 pH, 0 – 4000 ppm, 0.00 – 6.00mS/cm, ACCURACY ±0.20 pH AND ± 2% FULL SCALE FOR EC AND TDS SUPPLIED WITH MA850 COMBINATION ELECTRODE, A9V BATTERY, A 20ml SACHET BUFFER SOLUTION OF pH7.01, 1500 ppm AND 1.413µS/cm SM801 meter also available upon request, at same price. Only difference is maximum of 1990 ppm.