A printer includes a print unit; a processor; and memory storing computer readable instructions that, when executed by the processor, cause the printer to: operate the printing unit in an operation mode, which is one of a power supply mode and a power saving mode, wherein power consumption in the power saving mode is less than power consumption in the power supply mode; execute a correction process to acquire a correction value; adjust printing characteristics of the print unit in accordance with the acquired correction value; and in case that a particular condition is satisfied while the correction process is performed and there is a print job to be executed in accordance with the adjusted printing characteristics after completing the correction process, change the operation mode from the power supply mode to the power saving mode after completing the correction process and executing the print job.