Information from a wiki page I did.
Dr. Leonard McCoy's Medical Scanner, a compact hand-held sensor probe for determining a patient's health while on the field or out of Sickbay. Jokingly referred to as `The Salt-Shaker' due to its shape and size, but that's a misnomer; The actual salt-shaker medical tools were conical and had black or orange rubberized sides, but were machine-duplicated as conical laser scalpels, or engineering tools. The Medscanner was a home-made production prop, made just for the show.
Standard Medscanner units were programmable for ten different functions - pulse rate, respiration, body temperature, cell rate, lung capacity, heart activity, blood pressure, basal metabolic rate, brain activity, homeostatic deviation.
Though primarily a medical scanner, it can be reconfigured for other uses. In the year 2268, Commander Spock, first officer and chief science officer of the Federation Starfleet starship USS Enterprise 1701, original configuration, used a medscanner when the science station picked up an energy reading from the bridge: the source being Elaan's necklace of Radan crystals, 'common stones' on Elas, which were actually dilithium. He was standing at his console and she was near the turbolift alcove. He was able to detect the dilithium from that distance.
The McCoy-type had a rubberized black grip over the metal body, a clear sensor casing, and a rotating sensor. The back of the scanner, however, was blank metal, and Dr.McCoy had to discern the patient's condition by the aural signals (the warbling sound). However, a diagram on the old technical manual showed a display on the back, a miniature version of the Sickbay medical monitor. This version has that display
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