MANUFACTURERS' LITERATURE MPI Applications Notes, Vol. 3, No. 3. A phase sensitive detection system, usfciul in null balance ac bridge appli cations, is discussed. McKee-Pedersen Instruments, P. 0. Box 322, Danville, Calif. 94526
temperature clock?
Engineering Notes, Vol. 16, No. 3. Model 301, an all solid-state electrom eter operational amplifier, is discussed. Keithley Instruments, Inc., 28775 Au rora Rd., Cleveland, Ohio 44139
TOTAL SUGAR DETERMINATIONS IN LESS THAN 5 MINUTES... AUTOMATICALLY!
Engineering Notes, Vol. 16, No. 4. Model 419, an automatic ranging picoammeter featuring fast, precise mea surements from 1 0 - 2 to 10 _ 14 ampere, is presented. Keithley Instruments, Inc., 28775 Aurora Rd., Cleveland, Ohio 44139 Engineering Notes, Vol. 16, No. 5, Models 414A and 414S, low-cost all solid-state picoammeters featuring better than 0.5%/week stability, are discussed in this issue. Keithley In struments, Inc., 28775 Aurora Rd., Cleveland, Ohio 44139 Sage Commentary, March 1968. Sy ringe pumps, their uses for industry and research, and how to select the right pump for a particular applica tion are the articles offered in this is sue. Sage Instruments Inc., 2 Spring St., White Plains, Ν. Υ. 10601
Right! But the YSI Model 66 Temperature Clock actually can't give you the correct time or temperature. It can do these three things: • indicate mean tempera ture and degree hours. • indicate mean tempera ture and degree hours dif ference between two points. • indicate mean tempera ture and degree hours above or below an externally set temperature threshold. The battery operated YSI Model 66 Temperature Clock can operate continuously for up to six months in a range from - 2 9 ° C to +49°C. Usa ble information is available after as little as ten hours. If you have a project in volving mean temperature, we may be able to help you with it for $345.00. YELLOW SPRINGS INSTRUMENT CO. YELLOW SPRINGS, O H I O 4 S 3 8 7 Circle No. 149 on Readers' Service Card
108 A
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ANALYTICAL CHEMISTRY
Solutions, Vol. VII, No. 2. The ul trastructure of gamma M immuno globulin and œ-macroglobulins as revealed by electron microscopy are reported in this issue. Gelman Instrument Co., 600 S. Wagner Rd., Ann Arbor, Mich. 48106 The Laboratory, Vol. 36, No. 2. Laboratory applications of several company instruments are presented in this issue. Fisher Scientific Co., 711 Forbes Ave., Pittsburgh, Pa. 15219 Information, No. 64. Applications of a number of company instruments are discussed in this issue. Carl Zeiss Inc., 444 Fifth Ave., New York, Ν. Υ. 10018 Modern Precision, Vol. 28, No. 1. New products and applications of the company's process equipment are dis cussed. Leeds & Northrup Co., Sumneytown Pike, North Wales, Pa. 19454 The INFOrmer, No. 14, Spring, 1968. This issue introduces two low cost gas chromatography integrators, Models CRS-110 and CRS-108. Infotronics Corp., 7800 Westglen Dr., Houston, Texas 77042
Model 718-100
The Leco Automatic Sugar Determinator mechanizes the Lane-Eynon method and elimi nates visual titration and its associated errors. It can be operated by un trained personnel and is so automatic t h a t the operator need not be present during titration. Actual determinations require only 3-5 minutes but additional time is saved in sample prep aration because results are un affected by insoluble matter or color interference. Write today for details on LECO's new, low cost, Auto matic Sugar Determinator.
LECO
LABORATORY EQUIPMENT CORPORATION
1415 H i l l t o p R o a d St. J o s e p h , M i c h i g a n 49085, U.S.A.
Circle No. 120 on Readers' Service Card
