PH-301 Digital PH Controller Ph Meter Water Purity Tester Acidity Detector with

Resolution: 0.01PH. Set Range: 3.50~10.50pH. 1 x Detachable pH electrode. Input Resistance: 10 12 Ω. With OPTIONAL HI/LO ACTION. APPROVED BY STRICT QUALITY AND SAFETY STANDARDS which ensures a reliability, durability, long and trouble-free life.

eBay