ORP: -650 to 700 Hydrogen: Upto 1000 ppb Warranty : 1 year. Additional Features: 110V power universal/ produce water pH 4.0 to 10.5 / +500 to -700mV ORP level. Advisable Input TDS Range : 50 ~ 200 PPM/ Super large 3.8 inch colorful LCD screen display. Amrut-jal - Antioxidant Alkaline Water Ionizer Machine With Automatic Valve 11 plates Old Panel.