from CURT/N •••«•em/
evacuate completely and instantly increase the accuracy of readings minimize breakage save important time
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T h e Celvac Cuvette is a unique device for eliminating cuvette problems normally en countered with spectrophotometers, photome ters, colorimeters and related equipment. B y connecting the Celvac Cuvette to a water filter pump (aspirator), electrically driven, pump, or any practical vacuum source, you can instantly evacuate the cuvette b y simply touching the vertical segment with your finger. You save time and t h e necessity to reposition, the cuvette. You minimize handling and conse quent breakage. You eliminate t h e need for expensive matched cuvettes required for opti mum accuracy. And, you reduce the problems of smudge, smear, spilling and scratching as sociated with constant removal of t h e cuvette from the instrument. T h e Celvac Cuvette is constructed of t h e highest quality optical borosilicate glass with a refractive index of 1.42. I t is available in all Standard sizes to fit most equipment models.
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I t is furnished complete with Tygon tubing, connectors and check valve, ready to operate. For more information, write W. H. Curtin a n d C o m p a n y , P . 0 . Box 1546, H o u s t o n , Texas 77001.
W.H. CURTIN & CO. f^ft
SCIENTIFIC
APPARATUS
AND CHEMICALS
' HOUSTON · TULSA · BIRMINGHAM · NEW ORLEANS · MlAMt • DALLAS · JACKSONVILLE · ATLANTA * CORPUS CHRISTI * ALBUQUERQUE · MEMPHIS · SAN ANTONIO · MEXICO CITY
Circle No. 41 on Readers' Service Card
KLETT PRODUCTS
Klett. COLONY MARKER AND TALLY. For the rapid and accurate counting of colonies. Marks and records at the same time, leaving per manent record for rechecking. When all of the colonies in an area or dish have been marked, the tally is read and then is reset to zero with the reset knob. Plates that would be considered too crowded for counting by the usual method can be counted easily with this instrument. The counting opera tion can be interrupted at any point without caus ing errors. Complete with pen and extension cord. For operation on 115 volt, A.C., 60 cycle.
KLETT BIO-COLORIMETER The visual color imeter illustrated presents a num ber of outstand ing features mak ing it ideal for clinical or r e search work. Built on t h e most modern mechanical and op tical principles it is widely accepted for accuracy and dur ability.
Klett
179 EAST 87th STREET, NEW YORK, Ν. Υ.
Circle No. 67 on Readers' Service Card 148 A
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ANALYTICAL CHEMISTRY
MANUFACTURING CO., INC.
