18A
ANALYTICAL
CHEMISTRY
To Measure pH With PRECISION CONVENIENCE
RELIABILITY
Balanced Design is the Requisite A p H M e t e r is a means to a n end — a tool t o s p e e d a n d f a c i l i t a t e a measurement. In a n y w e l l - d e s i g n e d t o o l there must be a c a r e f u l b a l a n c e a m o n g the elements o f Precision, Convenience, a n d R e l i a b i l i t y , f o r precision without convenience is costly a n d convenience without r e l i a b i l i t y is worthless.
But t o g e t h e r t h e y c r e a t e
•-Ιϋτ-
the true economy t h a t is the a i m o f all instrumentation. C o l e m a n p H Electrometers a r e the result o f y e a r s o f l e a d e r s h i p in the f i e l d o f p H m e a s u r e m e n t — y e a r s o f strict attention to the factors o f " B a l a n c e d D e s i g n " . They a r e realistic tools o f Precision, Convenience, a n d R e l i a b i l i t y .
COLEMAN pH Electrometers COMPAX Write Coleman Instruments, Dept. A, for complete data.
Model 2 0 —Portable Battery O p e r a t e d Ask for Bulletin B-225
MODEL 18 A. C. Line O p e r a t e d Ask for Bulletin B-221
COLEMAN INSTRUMENTS
AUTOTRATOR Model 19 Automatic Titrator Ask for Bulletin B-223
318 MADISON ST. MAYWOOD, ILLINOIS
Coleman "Balanced Design" means . . . Precision + Convenience + Reliability.
