HI 983317 is a simple-to-use EC and TDS controller, specially designed for the hydroponics and horticultural applications. Thanks to their compact size of only 8 by 5 cm (3 x 2?), they can be mounted in confined spaces and right next to the fertilizer mixing vats. Due to their incredibly low cost, these meters are ideal for all those start-up operations that up to now were manually maintained with substantial savings in time and considerable improvement of the yield. All meters requirer calibration solutions!