Hoping that someone can recommend a good, reliable DO meter. I am pesently using a CHEMetrics K-7512 kit to test for DO levels in my pond. I would like to upgrade to a digital Dissolved Oxygen meter to save time and get more precise DO readings. I hope to limit costs to about $500 - 600. My needs are to read dissolved oxygen and temperature. I would need the sensor cable length to be a minimum of 5 meters and woluld want a meter that is accurate, dependable and is easy to use. I would appreciate if anyone could recommend a meter for my use.