 Beckman had trademarked the design of the pH meter knobs, under the name "helipot" for "helical potentiometer".Rosenberg had found that the helipot was more precise, by a factor of ten, than other knobs.Nonetheless, for use in continuously moving airplanes, ships, or submarines, which might be under attack, a redesign would be needed to ensure that the knobs could withstand shocks and vibrations.