<p>Provided is a colorimeter (21) which is constituted to comprise a plurality of probe units (P) and a body unit (22) made capable of controlling the colorimetric actions of the probe units (P) and mounting and demounting the probe units (P). These probe units (P) are composed of a spectroscopic probe unit (Pn) and stimulation value direct-reading probe units (P1 - Pn-1). On the basis of the measurement result of the spectroscopic probe unit (Pn), therefore, the colorimeter (21) thus constituted can calibrate the stimulation value direct-reading probe units (P1 - Pn-1) easily. By the control of the body unit (22), the stimulation value direct-reading probe units (P1 - Pn-1) and the spectroscopic probe unit (Pn) are enabled to execute the measurements selectively or simultaneously according to an object to be measured.</p>
