THE INTELLIGENT BALANCE

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3300 Series electronic balance $1395.00 Made in U.S.A.

Scientech's new dual range toploader has built-in microprocessor controlled data handling capabilities.

Data Input Keyboard $250.00 Made in U.S.A.

THE INTELLIGENT ELECTRONIC BALANCE ...ONLY $1395.00

M o r e t h a n an e l e c t r o n i c balance, S c i e n t e c h ' s new 3300 Series is a data p r o c e s s i n g i n s t r u m e n t that c a n be p r o g r a m m e d t o p e r f o r m a w i d e r a n g e of c o m p l e x w e i g h i n g and data c o n v e r s i o n f u n c t i o n s . . . a u t o m a t i c a l l y , q u i c k l y and repetitively. A n o p t i o n a l data input k e y b o a r d is used t o p r o ­ g r a m t h e m i c r o p r o c e s s o r " b r a i n " in t h e balance, t h e n t h e b a l a n c e d o e s t h e rest. T h e 3300 c a n s t o r e data, c o n v e r t it f r o m o n e unit to another, c o u n t p a r t s a n d m u c h m o r e . A variable i n t e g r a t i o n t i m e f e a t u r e assures a c c u r a t e r e a d i n g s in h o s t i l e o r u n ­ stable e n v i r o n m e n t s . A n d , s i n c e t h e b a l a n c e d o e s t h e " t h i n k i n g " , not t h e k e y b o a r d , o n e k e y b o a r d can serve m a n y balances. Even if y o u d o n ' t presently need t h e data han­ d l i n g capabilities of t h e 3300, y o u still get a f u l l f e a t u r e d t o p l o a d e r at a great price. For instance, BCD o u t p u t is s t a n d a r d o n t h e 3300. So is w e i g h ­ ing in t w o ranges: 0-30.000g and 0-300.00g, instan­ t a n e o u s digital tare, clear LED display, all in a c o m p a c t and attractive case. Only S c i e n t e c h c a n o f f e r you an intelligent bal­ a n c e w i t h t h e s e f e a t u r e s f o r $1395.00. Call o r w r i t e f o r d e s c r i p t i v e literature. For more information write or call

SCIENTECH,

INC.

5649 Arapahoe Avenue • Boulder. Colorado 80303-303 444-1361

CIRCLE 1 9 6

PRA's high intensity pulsed light sources. The PRA 610 microsecond pulsed light sources offer maximum versatility for applications requiring high ultraviolet intensities. • Discharge energy per pulse to 100 joules • Repetition rate 1 to 100 pps • Spectral range 200 nm to 1200 nm with peak intensities inUV • Various pulse widths 1.5-50 μ sec. • Non magnetic lens aperture for ESR/NMR applications • Carefully designed for minimized RFI PRA manufactures pulsed light sources with a variety of pulse widths and discharge energies and has people with broad experience in optical systems design to advise you.

ON

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l Very large sample compartment Easy pushbutton operation Measures CD or PM voltage on same chart Photo (piezo) elastic modulator JASC0 Model J-500 Spectropolarimeter measures circular dichroism from either 180 to 700 nm or 180 to 1000 nm with high resolution, extreme sensitivity and excellent, fast scan speed. Optional attachments make measurement and data processing extremely simple. MCD, Low Temperature, micro, LCD and Stopped flow accessories available.

Photochemical Research Associates Inc. 4 5 Meg Drive, L o n d o n , O n t a r i o Canada N6E 2 V 2 (519) 6 8 6 - 2 9 5 0 Telex 064-7597 CIRCLE 1 8 5 O N

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JASCO INCORPORATED 218 Bay S t r e e t E a s t o n , M a r y l a n d 21601 (301)822-1220 CIRCLE 1 1 4 O N

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ANALYTICAL CHEMISTRY, VOL. 5 1 , NO. 2, FEBRUARY 1979 · 205 A