Difital ph testers.

i have two questions about digital ph testers are they accurate i know it would be depending on the brand and what not but on average are they?
and can you get these digital ones in just pet stores or fish stores?

The digital ph meters are way more accurate than test strips and/or ph drops.

Here is the one I use... not much money and really nice results:
http://www.amazon.com/Oakton-35423-10-pH-Tester-EcoTestr/dp/B004G8PWAU

I got even cheaper ph and ppm testers just for the he'll of it on eBay. About $12 each. Calibrated and tested them against expensive units and they seem to work fine. As for how long they will last...who knows, but I barely use them in my soil grow with RO water, so probably a while.

im trying to not get everything i need off of the net trying to brake it up a bit i have never got anything deliverd to my post office and think it will be a bit sus getting a fan grow tent and lights sent within a month or two lol i hope it dont say what the product is on the box :/