New Products Series 600 programmable calculators now solve problems directly with algebra, by use of symbols such ais parentheses, up-arrows for exponen tials, and alphabetic variables. This Formula Programming Pack is $400. Other new additions to the 600 line include statistics and advanced sta tistics packages for $250 and $400, respectively. Wang Laboratories, Inc. 617-851-7311 420 Four-digit multimeter, Model 4300, is offered in a rugged portable case and can operate either on-line or on-battery. The display is easy t d read. $650. Dana Laboratories, Inc. 714-833-1234
421 Model 124 .digital photometer incorpo rates a negative high-voltage supply (—50 to —2000 V), current measuring circuit, dark current cancellation, and scale expansion in a single rack-mount instrument. Features include: 100 pA to 1 mA full scale, 0.1 pA resolution, 100% overranging, and rear panel BCD OHtput. $975. Pacific Photometric Instruments. 415-654-6585 422 Model A-4 fluorometer has been modi fied for work in nephelometry as well as fluorescence analysis. The ratio fluo rometer, double-beam system, has also been modified to accept nephelometric procedures. Model A-4, $1800; ratio fluorometer, $2120. Farrand Optical Co., Inc. 914-428-6800 423
Dataspan 400 Series couplers are de signed to interface with any laboratory or analytical instrument with output in either analog or digital form. Each coupler converts information to com puter-compatible format and language for either off-line recording or on-line entry. There are six different couplers to meet varying needs. $995 to $2995. Ambient Systems, Inc. 415-323-1841 425 Laser spectroscopy detector system (LSDS) is a modular instrument to ac curately and conveniently measure pulse intensities of pulsed lasers; It simplifies signal processing in dual-beam optical and infrared spectroscopy where pulsed lasers, parametric oscillators, or flash lamps are used. Heart of the system is the gated integrator which will integrate a voltage waveform only during the period of an external gating pulse. An applica tion note is available which outlines the basic theory of operation and provides examples of specific uses of the system. Molectron Corp. 408-738-2661 426
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Air-free ninhydrin system foramino-acid analyzers is designed to operate in highpressure chromatography systems and can be used in a variety of liquid-chromatography procedures with other reagents. The system transports ninhydrin from supply bottles to a reservoir, then on to the high-pressure part of the analyzer. Two special fluid valves permit transfer from low-pressure to high-pressure parts of the analyzer without allowing air con tact. $2000 to $5000. Durrum Instru ment Corp. 415-321-6302 427
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Six new 300-sample liquid-scintillation systems have been introduced. Three are multiple-user systems which ac commodate up to six individual counting programs at one time. In all these sys tems tritium E2/B is greater than 120 at room temperature; tritium efficiency is better than 60%. The 300-sample bi directional changer can be programmed to count each sample in succession, or to select single samples or special groups of samples for repeated counting while others are bypassed. $12,550 to $22,200. Beckman Instruments. 714-871-4848 428
Helicore bench unit for ultrafiltration and reverse osmosis has applications in solvent-solute separations and concen trations. Key to the unit is a six-element module of helical wound membranes. Each element in the module is 2 ft long and contains 0.2 sq ft of membrane area. A variety of membrane elements suitable for specific applications is available. $2750 to $3450. Universal Water Corp. 714-453-8870 424
Monochromatic system consists of a xenon or xenon-mercury arc lamp, power supply, arc lamp housing, double monochromators, and appropriate optics. The double monochromators provide a nar row spectra bandwidth at selected wave lengths while suppressing stray light at other wavelengths to 1 part in 100,000. Optional accessories include dual wave length drives for spectra scanning. Less than $2200. Schoeffel Instrument Corp. 201-664-7263 429
and of course, higher gain, less noise and faster rise time are just some of the basic advantages y o u get when you choose H A M A MATSU — the company w i t h the most up to date manufacturing techniques. When we say " w i d e selection", it means maximum choice in size (1-1/8", 1-1/2", 2 " , 3 " ) , photocathode (Sb-Cs, Ag-O-Cs, Ag-Bi-O-Gs, Cs-Te, Bialkali and Multialkali), spectral response ranging f r o m 1600 - 8500 Â , etc. If you are in need of tubes for photo counting, our R464 (rated several c.p.s.) is the one for y o u .
For completely detailed brochure, uvrire nr call To:
H A M A M A T S U T V CO., LTD. 1126, Ichino-cho, Hamamatsu, Japan Telex: 04225 185 Cable: H A M A TV H A M A M A T S U HAMAMATSU CORPORATION 3000 Marcus Avenue, Lake Success, N.Y. 11040, U.S.A.
Telex: 967 869 Phone:
(516)354-7121
CIRCLE 9 9 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL.
44, NO. 9, AUGUST 1972
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