Hendrick's Ultrasonitest Ultrasonic Test Kit Hendrick's Ultrasonitest ultrasonic test kits are made in Australia by Hendricks Instruments Service. > Use a U.S.T. disk to ensure your ultrasonic cleaner is working effectively > Each U.S.T. disk is guaranteed for up to 60 uses, after which the disk requires replacement > U.S.T. disks are not sold separately What is included in an Ultrasonitest kit > Ultrasonitest disk with keyring > Ultrasonitest pencil > Pencil holder > Information booklet with usage chart