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Every horse owner should have a good hoof knife for trimming away loose and dried out sole or ragged frogs between visits to the farrier. About World Precision Instruments (WPI) For 50 years, WPI has offered laboratory products in several areas of study, the core being tissue and cell biology (including microinjection), animal physiology and electrophysiology. Our products have been cited in thousands of notable publications. Our mission is to continue to present you with relevant, reliable scientific instruments and lab supplies.