Rigrule Products Here, you can find a collection of Rigrule products that have been specifically designed to let you clearly assess and mark measurements safely when working from height. Used by professionals in various construction industries such as engineering, rigging, and drilling contractors, Rigrule products are light, compact and well-designed. You’ll find items such as the Rigrule Oilfield Measuring Tool - a unique stainless-steel ruler that clearly displays inch fractions for use with O.D and I.D callipers. And you can use that product in conjunction with the Rigrule Tally book, created especially for simple and accurate record-keeping of measurements and calculations.