Starrett S770BXTDZ Electronic 3-Point Contact Internal Micrometer Set, 3/8 – 3/4″

Original price was: $4,133.00.Current price is: $3,647.00.

The Starrett S770BXTDZ has built-in Bluetooth technology and SPC output. It features a 3/8-3/4” measuring range and .00005” resolution.

Product Description

The Starrett S770BXTDZ 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.

This set includes the following ranges: 

  • 0.625 in to 0.75 in /12.5 mm to 16 mm
  • 0.375 in to 0.5 in/16 mm to 20 mm
  • 1/2 in to 5/8 in/10 mm to 12.5 mm


  • 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 S770BXTDZ 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 5.1 lbs
Dimensions 12.5 × 10 × 3.5 in
Range (in)


Range (mm)


Resolution (in)


Resolution (mm)


IP Rating


SPC Output


Data Output Type

Cable; Wireless with Transmitter

Movement of Screw


Inside Micrometer Type

3-Point Inside Micrometer

Operation Type

Electronic/ Digital

Thimble Type

Ratchet Stop

Contact Point Material


Display Type



Inch/mm Conversion; Reducing The Need to Exchange Anvils


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

Included Ranges

0.625 in to 0.75 in /12.5 mm to 16 mm
0.375 in to 0.5 in/16 mm to 20 mm;
1/2 in to 5/8 in/10 mm to 12.5 mm

Max Meas. Depth


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