i know that get what u pay for is defently a true statement, but at the current time i have spend a lot of money on all of my materials and was wondering if for my first grow i could get by with a cheep one? i know that a 20 dollar one on ebay will most likely give me the "you get what you pay for" but i have come to see that I most likely can't survive without one from more forums iv been though

the links NEW Digital Conductivity EC Meter Hydroponics Nutrient - eBay (item 230219809472 end time Feb-11-08 20:00:00 PST)

has anyone tried this? it looks cheep and is cheep, but i don't really have $80+ right now... would this be a better option than changing my water ever 7-10 days?