C-23CMitutoyo reserves the right to change any or all aspects of any product specication, including prices, designs and service content, without notice.• Caliper type inside micrometer equipped with round pin or anvil type jaws, according to model.• Carbide measuring faces.• Equipped with a constant measuring-force device.• Optional Setting Rings (nominal size below 300 mm), CERA Inside Micro Checker (more than 25 mm) and Gauge Block Accessory Sets are available as reference gages for datum adjustment (refer to page C-47, C-26, and E-17 to E-20 for details). Inside MicrometersSERIES 345, 145 — Caliper TypeNote: This instrument requires the cap and the holder for mounting on a micrometer stand.Note: It may not be applicable to a custom specication.Holder (300400)Cap (300401)Inside MicrometersFor easy and accurate measurement of inside size and diameterSPECIFICATIONSMetricOrder No.Range (mm)Resolution (mm)Accuracy* (µm) JawMass (g)Digimatic (LCD)345-250-30 5 - 300.001±5Pin320345-251-3025 - 50±6Anvil325MetricOrder No.Range (mm)Graduation (mm)Accuracy (µm)JawMass (g)Analog145-185  5 - 300.01±5Pin130145-186 25 - 50±6Anvil140145-187 50 - 75±7Anvil160145-188 75 - 100±8Anvil180145-189100 - 125±9Anvil210145-190125 - 150Anvil230145-191150 - 175±10Anvil250145-192175 - 200Anvil270145-217200 - 225±11Anvil310145-218225 - 250Anvil330145-219250 - 275±12Anvil350145-220275 - 300Anvil370InchOrder No.Range (in)Graduation (in)Accuracy (in)JawMass (g)Analog145-1930.2 - 1.20.001 ±0.00025Pin130145-1941 - 2±0.0003Anvil140145-1952 - 3 ±0.00035Anvil160145-1963 - 4±0.0004Anvil180Technical Data • Battery and Scale Type (for 345-250-30/251-30/350-30/351-30)SR44 (1 pc), 938882, for initial operational checks (standard accessory) • Battery life: Approx. 2.4 years under normal use• Scale type: Electromagnetic induction-type rotary encoderOptional AccessoriesRefer to page A-25 for details.• Connecting cables for Input Tool/Digimatic Mini-Processor, etc.1 m: 05CZA6622 m: 05CZA663• USB Input Tool Direct (2 m): 06AFM380B• Connecting cables for U-WAVE-TFor standard (160 mm): 02AZD790B For foot switch: 02AZE140BAccessories for 145-185/186/193/194 (optional)Products equipped with the measurement data output function can be connected to the measurement data network system MeasurLink (refer to page A-5 for details).Note: The minimum pitch circle measurement is ø5 mm with pin types (145-185 and 345-250-30).345-250-30145-185145-187Inch/MetricOrder No.Range (in)ResolutionAccuracy* (in) JawMass (g)Digimatic (LCD)345-350-300.2 - 1.20.00005 in/ 0.001 mm ±0.00025Pin320345-351-301 - 2±0.0003Anvil325* Excluding quantizing error Note: For the functions, refer to 293 Series with SPC data output on page B-8. This model is NOT water-proof. Also, the origin setting is the free preset type.

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