Use your Landwind C40Vet to it fullest potential with a variety of probes. These probes are secifically for the Landwind C40Vet and offers a high frequency up to 10MHz. Recommended probe for dogs and cats: micro-convex probe 5.0-8.0MHz. For reptiles: linear array probe 5.0-10Mhz. For large animals: rectal probe 5-10MHz with a 13 foot long cord.