isert samples. The Zeiss Automatic Sample hanger accommodates six cells . . any cf which may be used as îference. Cells are supplied with athlengths from 0.1 to 5 0 m m , nd volumes from 12 μ Ι to 15ml. nly Zeiss Automatic Changers ave a six-cell capacity.
Set control unit. Offers a u t o m a t i c " i n - t h e beam" dwell time from 2 to 60 seconds, and cycle time from 1 to 15 minutes. An automatic slit ad justment repeats the setting of each blank with an accuracy of —0.002A after each cycle. This unit automatically controls move ment of sample holder.
Now... automated spectrophotometry, t0.002A accuracy!
Select 1 or 2 wavelengths. You can match the six cells electronically to - 0 . 0 0 2 A at two wavelengths, or offset any up to 0.4A in case of overlapping curves. A long (180cm) parallaxfree projected scale gives you un matched reading accuracy and permits precise repeatability.
Read results. The recorder, with clearly coded and numbered chart, is auto matically operated on command. This eliminates the confusion of meandering lines, and the incon venience of miles of waste re corder paper. Only Zeiss offers this important feature.
What features could you want in a spectrophoto meter? Unequalled accuracy? Solid stability? The convenience of automation? The Zeiss PMQ II with Automatic Sample Changer has them all. It's the ideal instrument for work in enzyme kinetics and other time-rate studies, for analysis of chromatographic columns, and for recording of absorption spectra. With auxiliary equipment, you can perform melting point analyses, and fol low denaturation processes. Consider these outstanding features: Built-in micro-optics allow you to get full sensitivity from the monochromater, even with microcelis. 100point accuracy is ± 0 . 0 1 % . Scale expansion is 1.0, 0.5, and 0.2A. If you already own a Zeiss PMQ II, you can easily add an Automatic Sample Changer. The precision optical bench makes prealignment a simple job. Write or phone for information on the PMQ II with Automatic Sample Changer. Carl Zeiss, Inc., 444 Fifth Ave., New York, N.Y. 10018. In Canada: 14 Overlea Blvd., Toronto 17, Ontario. Complete service facilities available.
ZEISS
THE GREAT NAME IN OPTICS Circle No. 184 on Readers' Service Card
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