Hanna Instruments HI 9829/10 Multiparameter Water Quality Meter, with 10m pH/EC/DO Probe and Kit Measures 12 different water-quality parameters, including pH, EC/TDS, ORP, DO, atmospheric pressure, and temperature Tag identification system and internal GPS for tracking location of samples Logs up to 60,000 samples with 12 measurements each USB connection and Windows-compatible software for easy data downloads Durable and waterproof body