Applications: *Measture the cast iron thickness,aluminum thickness,quartz glass thickness,PVC thickness,PE thickness,red copper thickness etc. Details: Case Material: Aluminum Alloy Operating Principle: Ultrasonic Measuring Range (metric / Imperial):0.75~400 mm ( 45 # steel, Depend on Probe ) Sound Velocity: 500~9,990 m/s Resolution:0.01 mm / 0.1 mm Accuracy: � (0.5%n + 0.05) For more details,please do not hesitate to contact us.Thank you!