A calibrating system for a dimensioner, the system comprising: a reference object, the reference object comprising: predefined physical dimensions, and the reference object comprises reference marking, barcode and RFID tag applied on an outside surface of the reference object; and the dimensioner, comprising: at least one sensor configured to remotely sense features of an object; a processing device; and a dimensioning unit configured to enable the processing device to: calculate physical dimensions of the object from characteristics sensed by the at least one sensor; determine if the object is a reference object based on detecting one or more of the reference marking, the barcode, and the RFID tag in the sensed features of the object; in response to determining that the object is a reference object, compute dimensions of the reference marking; determine if the reference markings are valid and if the reference markings are valid, reading and decoding the bar code and the RFID tag in order to determine whether the reference object is a valid reference object based at least in part on a matching between a security code obtained from the barcode and a second security code obtained from the RFID tag; and if the reference object is determined to be a valid reference object, to: compare the calculated physical dimensions with the predefined physical dimensions to determine an error value; and calibrate the dimensioner to compensate for the error value. at least one sensor configured to remotely sense features of an object; a processing device; and a dimensioning unit configured to enable the processing device to: calculate physical dimensions of the object from characteristics sensed by the at least one sensor; determine if the object is a reference object based on detecting one or more of the reference marking, the barcode, and the RFID tag in the sensed features of the object; in response to determining that the object is a reference object, compute dimensions of the reference marking; determine if the reference markings are valid and if the reference markings are valid, reading and decoding the bar code and the RFID tag in order to determine whether the reference object is a valid reference object based at least in part on a matching between a security code obtained from the barcode and a second security code obtained from the RFID tag; and if the reference object is determined to be a valid reference object, to: compare the calculated physical dimensions with the predefined physical dimensions to determine an error value; and calibrate the dimensioner to compensate for the error value. calculate physical dimensions of the object from characteristics sensed by the at least one sensor; determine if the object is a reference object based on detecting one or more of the reference marking, the barcode, and the RFID tag in the sensed features of the object; in response to determining that the object is a reference object, compute dimensions of the reference marking; determine if the reference markings are valid and if the reference markings are valid, reading and decoding the bar code and the RFID tag in order to determine whether the reference object is a valid reference object based at least in part on a matching between a security code obtained from the barcode and a second security code obtained from the RFID tag; and if the reference object is determined to be a valid reference object, to: compare the calculated physical dimensions with the predefined physical dimensions to determine an error value; and calibrate the dimensioner to compensate for the error value. compare the calculated physical dimensions with the predefined physical dimensions to determine an error value; and calibrate the dimensioner to compensate for the error value.