Dear all, thanks to those who offered. Have gotten the pH controller. Now looking for pin point pH monitor, ORP controller and sander ozoniser C100 or similar. If you have one and willing to sell, please kindly pm me. Thanks.
p/s: Dear seller, a new pin point ORP controller cost $319 and the probe will cost $99. If your product comes with warranty and effective probe(less than 3 months), will consider paying reasonably. If not, please quote reasonably. Similarly for the pinpoint pH monitor, brand new at $149 and probe is $65. Thanks.