Starrett 770BXTZ-375 Electronic 3-Point Contact Internal Micrometer, 5/16 -3/8″ Range

Original price was: $1,594.00.Current price is: $1,407.00.

The Starrett 770BXTZ-375 has built-in Bluetooth technology and SPC output. It features a 5/16-3/8” measuring range and .00005” resolution.

Product Description

The Starrett 770BXTZ-375 provides IP67 protection against coolant, water, dirt, and dust in hostile shop environments. In addition, it offers extended travel, reducing the need to exchange anvils. The ground contact points set the internal micrometer faster and more accurately than the spherical contacts found on other gages.

The rugged and accurate internal micrometer is available individually or in sets from .080″ (2mm) to 12″ (300mm).


  • Wide measurement range without changing anvils
  • Carbide measuring faces on sizes above 5/16″ (7.9mm) diameter
  • Extensions available for deep holes
  • Precision ratchet stop provides correct contact pressure for accurate readings.
  • Each micrometer bore gage with head comes with a wooden case, a setting ring, contacts, an adjusting wrench, a spare battery, and instructions.
  • IP67 level of protection against coolant, water, dirt, and dust
  • Large high-contrast LCD digital readout is easy to read and reduces error
  • RS232 output
  • Includes instant inch/millimeter conversion and preset + and – functions
  • Proximity output with optional built-in Bluetooth
  • Bi-directional communication


  • Manufacturing
  • Machining
  • Automotive
  • Aerospace
  • Medical
  • Energy

IP67 Rating

The 770BXTZ-375 IP67 rating refers to its ability to resist damage from dust and water. For a device to have an IP67 rating, it must withstand immersion in 1 meter (3.3 feet) of water for 30 minutes without suffering permanent damage. These calipers are ideal for environments exposed to liquids and dust daily.

About Starrett

The L.S. Starrett Company is a world leader in precision measuring tools and instruments. Since 1880, they have been an industry standard. Starrett’s high quality and durability have made the brand an industry standard for decades. They produce products for various industries, including aerospace, automotive, manufacturing, and commercial construction. Today, they’ve expanded into metalworking, making saw blade products for manufacturing operations worldwide.

Additional Information

Weight 2.3 lbs
Dimensions 8.7 × 6.7 × 2.3 in
Range (in)


Range (mm)


Resolution (in)


Resolution (mm)


IP Rating


SPC Output


Data Output Type

Cable; Wireless with Transmitter

Inside Micrometer Type

3-Point Inside Micrometer

Operation Type

Electronic/ Digital

Contact Point Material


Display Type



Adjusting Wrench; Contacts; Instructions; Setting Ring; Spare Battery

Accuracy (in)


Accuracy (mm)

±0.004 mm


Inch/ Metric

Maximum Measuring Depth


Approx. Meas. Depth (in)


Approx. Meas. Depth (mm)


Ring Diameter (in)


Ring Diameter (mm)



Inch/mm Conversion; Reducing The Need to Exchange Anvils

RS232 Output


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