This provides compatibility with virtually any Bayard-Alpert ion gauge, including glass tubulated
, nude, nude-UHV, Stabil-Ion, and Micro-Ion.
Several studies indicate that gauge-to-gauge sensitivity variations are not unusual for seemingly identical tubulated BAGs, and that an accuracy of 25% at midrange should be considered good.
For this reason, tubulated gauges are available in single- and dual-filament designs.
Tubulated gauges owe their popularity to their low cost, convenient measurement range, and ease of mounting.
Gauge-to-gauge reproducibility has been shown to be worse than that of tubulated gauges, particularly for extended UHV versions.
High-accuracy gauges operate on the same ionization principles as nude and tubulated gauges; however, they provide highly accurate, reproducible, and stable pressure readings by systematically avoiding the known problems associated with other gauge designs.
High-accuracy gauges are expensive, costing up to 10 times as much as a typical tubulated gauge.