ID Measurement: Range-0.375″ to 1.200″. Depth to 6″.
Hardened steel construction
Brass probe beads: 0.040″ projection
6″ probes graduated in inches and metric
Measure barrel wall thickness (BWT) with BWT device. Accuracy: +/0.002″
ABS scales always read true position
Floating zero, relative measurements and absolute measurements
Operates on a single type 357/SR-44 battery, 2 year life
Includes 0.725″ calibration ring and calibration strip 0.025″ for BWT measurement
Includes instructional DVD
Barrel Wall Thickness Kit
Four Calibration Rings are available in the following gauge sizes: 12, 20, 28 Gauge and 410 Bore. The 12 Gauge Calibration Ring is included with every BoreMaster. The 20, 28, and 410 rings can be purchased individually.
A Good Reason to Own A BoreMaster: A Personal Experience Worth Sharing
by Bob Foege, BoreMaster Inventor
At a recent pheasant hunt, one shooter was using a magnificent Parker 12 gauge Frame 4. I routinely use the BoreMaster to measure older guns – for safety reasons as well as my own curiosity – and I discovered that this Parker had been drastically cleaned up inside; bore diameter after the chamber was 0.753″ and bore diameter 5″ in from the muzzle was 0.744″. Nominal 12 gauge bore size is 0.729″. The barrel wall thickness 5″ from the muzzle was 0.023″!
Although the owner was shooting target loads successfully, I warned him against using heavy pheasant loads and suggested that he have the barrel wall thickness measured mid-barrel.
The photo illustrates what a 1-1/4 oz. pheasant load did to the left barrel of this compromised gun.
Luckily no person was injured. Although the owner ignored my advice, the BoreMaster did its job by indicating a potentially dangerous condition. If the owner had used the BoreMaster when buying the gun he probably would have wisely declined the purchase.
The BoreMaster is an easy-to-use and serious tool for the gun owner and gun trader, providing critical information for all gauges, not generally available without this tool.
From time to time, we have Shotgun Combo Gauges and BoreMasters that have slight imperfections, but are perfectly functional.
We offer a 15% discount for these products. Please inquire about them via our contact form or phone; they are not available on the website.