Features: Equipped with 4 measurement functions, with this product, you can measure inside diameter, outside diameter, depth and step. With the power switch (OFF/ON), inch and mm units conversion switch. Made of stainless steel, IP54 waterproof, rust resistant, practical. Four kinds of measurement range for optional, choose what you need. Large LCD screen, easy to get the precise data, no more frustration from imprecise measurements or difficulty reading the lines. USB interface allows data to outputted to a printer or computer for data processing and printing.