Bluelab make pH and EC measuring devices. All their products come with a good warranty and some are guaranteed for 3 years.
Bluelab do an easy to use hand-held EC pen and pH pen. One of there most popular products is the Bluelab EC truncheon which is a pretty awesome product. Simply place the truncheon in your water butt wait a couple of seconds and the EC truncheon will light up with your EC reading really easy to read and simple to use.