1 Case contains 25 shelf boxes. Each shelf box contains 10 packs, 20 covers per pack, 5000 per Case. For use with ThermoScan Thermometer. Thermoscan® Pro 6000 probe covers are compatible for use with Thermoscan® Pro 3000 and 4000 devices. Correct technique must be used to load a probe cover and ensure a secure attachment and normal operation.