Starrett 781BXTZ-375 AccuBore Electronic Pistol Grip Bore Gage with SPC Output, 5/16 – 3/8″

Original price was: $2,731.00.Current price is: $2,410.00.

The Starrett 781BXTZ-375 AccuBore is a high-quality, trigger-activated, three-point contact bore gaging system with extended range and Bluetooth Data Output.

Product Description

Starrett’s 781BXTZ-375 offers convenient single-hand operation providing speed and control. Additionally, it features an easy-to-read digital display and mechanically-driven parallel anvils. These anvils extend simultaneously, establishing a true alignment to the axis of the bore. Thus providing consistent pressure and more accurate readings than models with spring-driven contacts. The 781BXTZ-375 also has a display with integrated LEDs tolerances that quickly indicate whether a bore measurement is within a preset tolerance window.


  • Bluetooth® capability
  • Single-hand operation with right- and left-hand viewing flexibility
  • Large, easy-to-read display
  • Enhanced wear life with carbide-faced contacts – available from 1/2″ to 8″
  • Convenient “Go/No-Go” tolerance indicator lights
  • True alignment with mechanically-driven parallel anvils
  • Resolution .00005″ (0.001mm)
  • Accuracy of up to .00015″ (.004mm)
  • Push button inch/metric conversion
  • Preset and preset recall
  • Hold, max/min, and zeroing capabilities
  • Blind bore measurement is standard for .50″ (12.7mm) and above
  • Bluetooth Output capability for Statistical Process Control (SPC) analysis


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

Bore Gage Measurement Tips

Using a two-point or three-point contact measuring tool is usually a matter of preference, but there are some differences. A two-point contact rod-type inside micrometer is lighter, easier to handle, and more versatile over long ranges from approximately 6-107″ (150-2700mm). While most three-point contact tools have setting rings to ensure accuracy. If you desire close tolerance work with two-point contact inside micrometers, we recommend setting them to a ring gage or an outside micrometer.

Ensure Accurate Measurements

  • Always check for specks of dirt between the clamping surfaces of the rods and micrometer heads
  • Tighten all rods uniformly
  • Assemble long sections vertically or, with support, horizontally.
  • Because temperature can affect long rods in these tools, assemble them in the same environment you’ll use them.

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 8.1 lbs
Dimensions 18.1 × 11.5 × 4.2 in
Range (in)


Range (mm)


Resolution (in)


Resolution (mm)




Bluetooth Capability



Inch/ Metric

Operation Type

Electronic/ Digital



Accuracy (in)


Accuracy (mm)


Approximate Measuring Depth (in)


Approximate Measuring Depth (mm)


Ring Diameter (in)


Ring Diameter (mm)


Display Type



Hold; max/min; zeroing; inch/metric conversion; preset recall; true alignment

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