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Grotheory pH & TDS Meter Combo PH meter could measure pH and temp value; TDS Meter (include EC, TDS and Temp function) is 3 in 1 ergonomically designed tester meter. It can be widely used in all water quality testing situations, Water Purification Applications, Aquaculture, Hydroponic, Pool & Spa, Colloidal Silver, Water Treatment and so on. What You Will Get: 1 X TDS Meter Digital Water Tester. 1 X PH Meter Digital Water Tester. 1 X Leather case 1 X Plastic box a 2 X User manual 3 X PH Buffer Powder.