Standby refers to a situation where equipment is on the job and available for work, but not put into operation until needed. Standby rates are meant to reimburse the contractor for fixed costs such as depreciation, cost of facilities capital, and indirect equipment costs. By default, CostTrax adopts the standard formula for standby as 50% of the Rental Rate Blue Book ownership cost.
See Adding Owned Equipment to a Request for details on how to add models.