Feather Touch Probes have been designed to gauge delicate surfaces such as glass, thin sections, pharmaceutical products and tiny electro mechanical components. Whereas the traditional gauging probe exerts a force of 0.7N, the Feather Touch probe when operated horizontally exerts a mere 0.18N. This is achieved by replacing the naturally elastic gaiter with a close tolerance gland. On pneumatic versions air leakage through this gland is less than 2.5ml per second at 1 bar pressure, avoiding surface contamination while still providing a degree of cleaning the probe bearing.