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Air Gaging has been around since 1909, when a French carburetor manufacturing company named Solex needed a method of checking carburetor jets. These first air gages were actually water meters that measured differences in water pressure. Later this design was adapted to utilize air. This design was much improved in 1943 by Mr. C.D. Moore of the Moore Products Company in Philadelphia, Pennsylvania. His design is the basis for modern‑day back‑pressure air gages like ours.

At about the same time, Sheffield Corporation decided that they would prefer to measure flow‑variations in the system rather than the back‑pressure. Most mechanical column systems are based on the Sheffield design and have tooling characteristics that vary somewhat from back‑pressure systems; but we have decided to price them as "Dual Master" tooling and accessories.

Dual master air gaging systems use a high and a low‑limit setting master, usually a ring or a plug gage (I.D. ‑ O.D. applications). These systems are characterized as "Back-Pressure" and/or "Flow‑Type" systems. Some brand names include, but are not limited to, the following list:

♦ SHEFFIELD
♦ EDMUNDS
♦ MOORE
♦ STANDARD
♦ FREELAND
♦ DEARBORN
♦ WESTERN

♦ AIR GAGE PRODUCTS
♦ THE AIR GAGE CO.
♦ MARPOSS
♦ PRATT & WHITNEY
♦ TOKYO SEIMITSU
♦ MERCER
♦ ETAMIC

....AND OTHERS

Some of these manufacturers also make single‑master air gages. They are characterized as "Differential‑Pressure" systems. One of the most recognized brand names is FEDERAL DIMENSIONAIR. These air tools are not compatible with dual ‑master systems and have a separate section in this purchasing guide.

Air Gage Products manufactures high‑quality air gage tooling for most of the air gaging systems. We are committed to customer service and offer consistantly lower prices and a better delivery time than our competitors. Our Air Comparator, AGP100‑C, is a simple, cost effective, manual air meter that works with all makes of back‑pressure or dual master air tooling. This website outlines configuration and pricing for most standard air gage applications, however, special air gages can be designed to fit most any application.