pH levels are important in soils, irrigation water and spray tank water. Soil and water pH is the single most important aspect in determining nutrient availability to crops. The pH levels in spray tanks determine the effectiveness of pesticides. The SoilStik pH Meter�s flat surface electrode, measures pH in soils, semi-solids, solids and liquids. No more electrode breakage or clogged junctions. An indicator tells you when it�s time to replace your electrode and when to re-calibrate the meter � which eliminates guesswork. Temporary memory recalls up to 15 sequentially tagged readings for easy recall. Automatic temperature compensated � simultaneously displays pH level and temperature of sample. Waterproof design floats in water and protects the meter in wet environments. Includes batteries, pH 4 and 7 solutions and soft case. Warranty: 1 year on meter; 6 months on sensor.