DWA (Advanced Digital Water Analysis) is a Hungarian company that produces advanced equipment for laboratory water analysis. The Growtent store offers various TDS, pH and ORP meters. We provide small pocket testers as well as large portable meters and large stationary meters. ADWA measuring equipment is perfect for water analysis in hydroponic systems, as well as for measuring fertilizer solutions with water for watering plants grown in coco or in soil. In addition to complete EC and pH meters, we also have replaceable electrodes. In our offer, you will also find many liquids for calibrating meters. Happy shopping.