Brand names: Milwaukee, YSI, Extech, Hanna, Rosemount, Mettler Toledo, Orion, Hach, Thornton...

Milwaukee is probably going to be the least expensive, but they only come with a 13 ft cable. I am not sure if they measure Temp.

I have an Extech that measures temp, DO, and Atmospheric Oxygen. Compensates for salinity and altitude. Only has a 13 ft cable, but is quite accurate, dependable and durable. Got it from Graingers, right about 420.00.

Multi Parameter units, and those with longer cables are going to be expensive.

I got some really good deals on ebay for some water quality analyses equipment, so that might be an option.

Just going to have to do some research.

Last edited by JKB; 02/26/11 10:18 AM.