Gauges, Layout & Testing

Aluminum pocket gauge for measuring loose stones and settings ranging from.03 points to 4 carats. A birthstone chart is embossed on reverse side.

An innovative gauge for measuring small stones, small parts, etc. Eliminates the problem of holding an item while measuring. Just place the stone or small part on the metal underplate and get a fast, accurate measurement. Gauge works great for normal measurement as well. Measures to 80 mm (3").

The Brown & Sharpe (B&S) Sheet Metal Gauge (also known as the American Wire gauge, or AWG) is the American standard for ordering wire and sheet sizes. One side of this sheet metal gauge from General Tools is marked 0 to 36 in AWG sizes, while the decimal inch equivalents are marked on back. An essential tool for both jewelers and metalsmiths needing to quickly determine the thickness of sheet metal or metal wire.

Useful for laying out model placement on rubber mold discs and for other uses.

Useful for laying out model placement on rubber mold discs and for other uses.

. Graduations 1/10 mm . Capacity 10 mm . Throat 12 mm

Our very popular Compact Digital Caliper now displays in three modes: metric, decimal inches, and fractional inches.

Our very popular Compact Digital Caliper now displays in three modes: metric, decimal inches, and fractional inches. Features include stainless steel construction, depth measuring blade, locking screw, non-marring plastic housing, and on/off, zero, and mm/inch buttons. A good quality digital caliper at an affordable price.

Central Tools offers this vernier caliper made of stress relieved stainless steel. Its internal, external, depth and shoulder measuring ranges are 0-6" (0-150mm) in .001"(.02mm) graduations. Caliper features a thumb lock to transfer measurements.

This handy gauge, known as a "pearl gauge" because it was first used for measuring pearls, is excellent for stones of all kinds. It's smooth action assures accuracy. Gauge is made to zero out when closed and opened automatically. This assures a gentle force by the user when measuring soft stones or pearls. The dial features "zero adjust" and is accurate to 0.1 mm. Equipped with locking screw and has a maximum opening of 20 mm. Fits neatly into pocket or purse.