Replacement Probe, Product Type Replacement Probe, Compatible with Manufacturer Model Number R7900, Compatible Product Type Ultrasonic Thickness Gauge, Features 5 MHz Frequency, Includes Ultrasonic Thickness Gauge Probe, Steel Thickness - Maximum 15.70 in, Steel Thickness - Minimum 0.04 in, Overall Diameter 0.78 in, Calibration Certificate Type Not Certified, Overall Height Not Applicable, Overall Length Not Applicable, Overall Width Not Applicable, Manufacturer Warranty Length 1 yr