Most bore gages measure a hole. Ours don't stop there. Pistol-grip, spring-loaded, self-centering built on a modular system that can measures threads, grooves, splines, gears, and just about anything else inside your parts.
Three contact points and a spring-loaded mechanism mean the gage centers itself in the bore the moment the anvils engage. No tilting, no rocking the geometry does the work, so you get the same results from every person in your shop
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The spring-loaded trigger applies the same measuring force every cycle. Same number from Jim, John, or Susie every time.
The pistol grip lets your operators measure right inside the machine, without unclamping the part. Get the size right while it's still on the spindle.
Customers regularly send in 20-year-old gages that still measure like new. The spring sits in its natural relaxed state so it's only compressed when you pull the trigger. It's rated at IP67 so it's been designed to hand the harsh environment of the shop floor.
A go/no-go plug tells you the part is wrong, not how it's wrong. With our system, you get the actual diameter including real pitch diameter on internal threads for a better understanding on where to course correct. With built-in Bluetooth, recording the measurments is made easy.
Plain bores. Threads. Grooves. Splines. Dovetails. Ball screws. Gears. Custom heads for your exact needs. The same pistol grip handles them all... just swap the head.
Explore the System →
Almost all customers start with a kit. A common starter covers 3/4" to 2". That's the range that hits the sweet spot for most North American shops
Real pitch diameter readings, not go/no-go.
Including undercuts and limited-clearance geometries.
Internal splines for drivetrain and power transmission.
Internal dovetails on slides, fixtures, and weapon systems.
Actual ball-track diameter. No surrogate measurements.
90° adapters reach over a foot inside a part.
Configured against your specific tooth geometry.
Tapered bores measured via two-diameter calculation.
Every system ships as a foam-fitted case. Handle, heads, setting ring(s), calibrated and ready to go.
12345Ergonomic handheld. Spring loading retracts the anvils, releasing the pistol trigger engages the anvils to your surface. Swap heads to inspect different sizes and features.
Self-centering heads sized to your bore range. Locks it in place with the same orientation every time, regardless of who the operator is.
Master ring to zero the gage to a known, calibrated size.
Reads the diameter directly with no conversion math. Connected via Bluetooth for data capture, logging or for transmitting to a bigger display. Display rotates towards or away from the operator to make it easier to read.
Each component has its place. Nothing rolls off the bench. Keep it tidy.
Fowler-Bowers 1" - 1.375"/25 - 35mm XTH3 Bluetooth Holematic Pistol Grip
Fowler-Bowers 1.375" - 2"/35 - 50mm XTH3 Bluetooth Holematic Pistol Grip
Fowler-Bowers 2" - 2.625"/50 - 65mm XTH3 Bluetooth Holematic Pistol Grip
Fowler-Bowers 3.250" - 4"/80 - 100mm XTH3 Bluetooth Holematic Pistol Grip
A valve manufacturer was scrapping parts that failed GD&T but only caught at final inspection. By moving to in-machine bore measurement with a pistol-grip system, operators corrected the diameter before the part ever left the spindle and the rejects stopped.
Different shops. Different parts. We find that we get specified for the same reasons across our customer base: shop-floor durability, operator-independent results, and a modular system that handles whatever the next job looks like.
Turbine components, engine accessory housings, structural fittings, and bearing bores all need measurements that hold across thousands of parts and dozens of operators.
Pistol-grip ergonomics and in-machine workflow fit production environments where pulling parts off fixtures isn't an option.
Bone screws, dental implants, surgical instrument bores, and orthopedic interfaces... applications where the consequences of a missed measurement are not abstract.
Brake caliper bores, master cylinder bores, valve bodies, engine blocks, and transmission components.
Valve seat measurement in crossbore valves where standard tools can't reach the seat geometry but a purpose-built custom head can.
Mixed work, rotating operators, unpredictable next-job features. The kit-and-expand model fits the flexibility that job shops demand.