TWICE AS i^^^^3 I • • •
3 TIMES AS ACCURATE P L U S UNIQUE AUTOMATIC REFERENCING and AUTOMATIC CONVERSION TO LINEAR ABSORBANCE
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COLEMAN DATA READER For Model 111 and Other S p e c t r o p h o t o m e t e r s . . . pH Meters...Computer Systems Studies by psychologists have shown that reading data from digital counters is twice as fast and three times as accurate as reading the same information from dials or scales. The Coleman Model 41 Data Reader saves more time, provides greater convenience with the unique set-reference control. Reference value is set automatically by a touch of the SETREF bar. It is no longer necessary to adjust your meter tediously to exactly 100% T or 0.00A. For descriptive literature, write today to Coleman Instruments Division, The Perkin-Elmer Corporation, 42 Madison St., May wood, III. 60 J53.
This unique Coleman feature minimizes temptation of operators to skip the referencing step and thus permits more consistent analyses in shorter periods of time. The Model 41 Data Reader also automatically converts % T output (common to most spectrophotometers, such as the new Coleman Model 111) to digital linear absorbance readings. Concentration can be related directly to absorbance readout, making interpolation simpler and much easier. WRITE FOR BULLETIN C-324
PERKINELMER 82 C&EN
