SKW 400 - Professional Soil Management Kit The SKW 400 Professional Soil Management Kit is the choice of the professional agronomist or soil chemist. The kit provides fundamental soil nutrient testing capability with the space to add up to seven additional soil reagent packs. The SKW 400 includes simple, field-ready soil test methods for macro nutrients (pH, lime requirement, NPK), calcium, magnesium and conductivity. Also included is the Bluetooth-enabled Soiltest 10 Photometer and Multiparameter Pocket Sensor. Offering excellent accuracy for a field instrument, the SKW 400 will reduce the need for costly off-site analysis of the critical parameters. The kit is protected by an IP67 waterproof field case with integral work surface for soil testing in any location.