NEW PRODUCTS
partial pressure measurements, gas adsorption and desorption studies, materials outgassing experiments, and chemical reactions occurring in vacuum. Varian Associates, 611 Hansen Way, Palo Alto, Calif. 409
The Expandomatic pH meter is a direct-reading, line-operated, pushbutton-controlled instrument that will perform pH and millivolt determinations with accuracy and repeatability. The instrument can also be the central element of a modular, electrochemical-potential measurement system. Used with the proper accessory, it can measure specific ions (such as Na+, C I - , Li+, NH 4 +, K^, and Ag+), blood p H , gaseous oxygen, dissolved oxygen and carbon dioxide in blood, oxidation-reduction potentials, and end point determinations in Karl Fischer and other electrometric titrations. Beckman Instruments, Inc., 2 5 0 0 Harbor Blvd., Fullerton, Calif.
410
WAVELENGTH IN MICRONS
YOU CAN SEE HOW PURE IT IS WHEN IT'S A FISHER "SPECTRANALYZED" SOLVENT The ZeromatJc II pH meter is an improved version of the Zeromatic pH meter. The instrument has double the pH accuracy of its predecessor. It is built around a new, taut-band meter with an 8.2-inch scale length for greater accuracy and repeatability than is attainable with conventional style meters. Pushbutton operation permits instant selection of pH or millivolt readout, automatic or manual temperature compensation, and standby or read functions. Beckman Instruments, Inc., 2 5 0 0 Harbor Blvd., Fullerton, Calif. 411
T h a t ' s because we record an u l t r a v i o l e t or i n f r a r e d a b s o r p t i o n curve (or both) f o r every f r e s h lot of these u l t r a - p u r e c o m p o u n d s . You get a copy of the curve—like the one above for Lot 7 4 1 6 1 8 of our A-19 " S p e c t r a n a l y z e d " Acetone—with every bottle you buy. You can see a t a glance exactly where the t r a n s m i t t a n c e is high enough t o give you a " w i n d o w " t h r o u g h w h i c h t o m a k e y o u r d e t e r m i n a t i o n s . There are now 18 h i g h - p u r i t y " S p e c t r a n a l y z e d " solvents, t r a n s p a r e n t t o u l t r a v i o l e t or n e a r - i n f r a r e d or b o t h . You'll f i n d t h e list, w i t h o u r p u r i t y s t a n d a r d s s p e l l e d o u t f o r each c o m p o u n d , in Fisher B u l l e t i n T D - 1 3 2 . For your f r e e copy, w r i t e to Fisher S c i e n t i f i c Company, 100 Fisher B u i l d i n g , P i t t s b u r g h , Pa. 1 5 2 1 9 . j.387
FISHER SCIENTIFIC World's Largest Manufacturer-Distributor of Laboratory Appliances & Reagent Chemicals
Complete stocks in these locations: Atlanta · Boston · Chicago · Fort Worth · Houston · New York Philadelphia · Pittsburgh · St. Louis · Union, N. J. · Washington · Edmonton · Montreal · Toronto Circle No. 54 on Readers' Service Card VOL. 3 6 , N O . 1 1 , OCTOBER 1 9 6 4 .
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