Supmea MDC-pH – PH Meter. PH Meter Relay:2 Output: 4-20ma *2 Communication : RS485 Power supply: 220VAC Measure range: -2 to 16pH Size: 144*144mm Display: Colorful (Curve and digital) IP rating: IP66 Language: English Russia Spianish and Chinese Available from IAE in New Zealand and the Pacific Islands.