I am in the process of starting up a pond service company and will need a reliable DO meter. I have looked at the Hana HI9147 and the Sper-Scientific, which are both available under $400. I really don't want to have to step up to a YSI at twice the cost if I don't have to. Any opinions?
And yes, in my area of Northern California, knowing the DO for each pond is critical, especially for monitoring the effectiveness of the aeration systems I hope to be installing quit a few of. Lack of oxygen is the number one problem in our ponds out here.
Thanks.
