Are you looking forward a digital caliper? This product equipped with 4 measurement functions, inch and mm units, IP54 waterproof, large LCD screen, these pros makes it perfect for you. 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. Specifications: Type: Type 1: 0-100mm Type 2: 0-150mm Type 3: 0-200mm Type 4: 0-300mm Material: stainless steel Color: black Units: mm/ inch (switchable) Display: LCD Display Measuring range: 0-100mm, 0-150mm, 0-200mm, 0-300mm(optional) Button: mm/in/ OFF/ON Power supply: 1 * 3V CR2032 Button Cell (2 Included) Product size: Type 1: 72 * 60 mm / 2.83 * 2.36 in Type 2: 235 * 75 mm / 9.3 * 3.0 in in Type 3: 290 * 90 mm / 11.42 * 3.54 in Type 4: 390 * 103 mm / 15.35 * 4.06 in Product Weight: Type 1: 100g / 3.53 ounce Type 2: 180g / 6.35 ounce Type 3: 200g / 7.05 ounce Type 4: 280g / 9.88 ounce Package Size: Type 1: 184 * 73 * 26 mm / 7.24 * 2.87 * 1.02 in Type 2: 260 * 105 * 32 mm / 10.24 * 4.13 * 1.26 in Type 3: 325 * 128 * 33 mm / 12.80 * 5.04 * 1.30 in Type 4: 432 * 136 * 33 mm / 17.01 * 5.35 * 1.30 in Package Weight: Type 1: 200g / 7.05 ounce Type 2: 400g / 14.11 ounce Type 3: 520g / 18.34 ounce Type 4: 760g / 26.81 ounce Package List: 1 * Vernier caliper 2 * 3V CR2032 button cell 1 * User manual