The TIS Multifunction Testers Calibration Checkbox is a precision calibration tool designed for use in various testing and inspection applications. Made by the renowned brand TIS and originating from China, this device ensures accurate calibration for measuring instruments and testers. Its multifunction capabilities make it an essential tool for businesses and industrial settings requiring precise measurements and inspections. With its reliable performance and comprehensive calibration features, this product is a valuable asset for maintaining quality standards in a range of professional settings.