The HI98130 makes measuring pH quick and easy! This lightweight, waterproof tester offers high accuracy pH, high range EC/TDS (0.00 to 20.00 mS/cm EC/ 0.00 to 10.00 ppt TDS) and temperature measurements in a single handheld unit! No more switching between meters for your routine measurements. Great for hydroponics, aquariums, pools, & ponds/p>