The Milwaukee MW802 portable 3-in-1 meter allows you to measure pH, EC (conductivity) and TDS with just one instrument using a single probe. (replaces model SM802) 

Supplied with the SE600 interchangeable probe - the pH electrode utilizes a fiber junction to reduce contamination when measuring fertilizer solutions. Calibrates manually in pH, Conductivity and TDS.

With a conductivity range that goes up to 6.00 mS/cm and the TDS up to 4000 ppm, the Milwaukee MW802 3-in-1 meter is ideal for testing during crop production.

This versatile meter has a large easy-to-read display and is simple to use. The MW802 comes complete with combination pH/EC/TDS probe, 20 mL sachet pH 7.01 buffer solution, 20 mL 1413 µS/cm sachet of calibration solution, 20 mL 1500 ppm sachet of calibration solution, one 9V battery and instructions.

Specifications:

pH Range - 0.00 to 14.00 pH
EC Range - 0.00 to 6.00 mS/cm
TDS Range - 0 to 4000 ppm
pH Resolution - 0.10 pH
EC Resolution - 0.01 mS/cm
TDS Resolution - 10 ppm
pH Accuracy: ±0.20 pH
EC/TDS Accuracy: ±2% Full Scale
Conversion Factor - 0.5
Calibration - Manual, at 1 point
Temperature Compensation - Automatic, from 0 to 50°C
Environment - 0 to 50°C / 32 to 122°F; max RH 95%
Battery Life - 150 hours of use
Auto-off - after 8 minutes of non-use

Dimensions - 7.28" long x 3.23" wide x 1.77" deep
Weight - 5.8 oz (with battery)
Warranty - 2 years

More info (PDF format)