the only place you have to look for fine laboratory equipment

variable detector give you an unbeatable µ -C system. The pump has no ball check valves to leak or stick at pLC's extremely low flow rates. It has no...
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Switch to ISCO MLC. Spend less on solvents, get better detectability and resolution.

With 1 mm columns and flow rates below 100 μΙ/min, ul_C lets you spend less on solvents, use smaller samples, and dramatically increase com­ pound detectability. But if your system wasn't designed for μΙ-C, you could be throwing those advantages away. ISCO's Model 314 syringe pump and V 4 variable detector give you an unbeatable μΐ_0 system. The pump has no ball check valves to leak or stick at uLC's extremely low flow rates. It has no detectable pulsation, and that means low noise at the detector. For top resolution, the V 4 detector has MLC flow cells with volumes from 0.12 μΙ to 1 μΙ, the smallest available. Its 0.5 s rise time and active filter minimize the distortion other detectors show with rapidly eluting peaks. And you can select any wavelength from 190 to 750 nm for maximum detectability. ISCO has the most sensitive and reliable μΙ-C system, but it doesn't cost the most. For more in­ formation call [800] 228-4250, toll free. ISCO, Box 5347, Lincoln, NE 68505.

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THE ONLY PLACE YOU HAVE TO LOOK FOR FINE LABORATORY EQUIPMENT

LABORATORY OVENS America's most complete line. From simple budget models at about $250 to large floor mod­ els with proportional controls. Mechanical and gravity, tem­ peratures to +704°C. includ­ ing: Batch, Vacuum, Aging, Drying-plus FRICTION-AIRE®, the patented electric ovens with no heating elements. Overtemperature protection on most models. CIRCLE 8

FURNACES Dozens of models . . . bench and floor types . . . to + 1620°C. All but budget models — which start at well under $400 have built-in overtemperature pro­ tection. All have solid-state instrumentation including Stabil-Glov and RAD-O-GLOW Globar® Furnaces with pat­ ented POWER-O-MATIC 80® SCR Proportioning Control for superb performance. CIRCLE 9

BATHS Water, oil, refrigerated . . . dozens of proven models, in­ cluding Shaker (standard and refrigerated), Hydrometer, Full Visibility Jar, Tissue. Temper­ atures from 0°C. to +260°C. Most feature patented MAGNI WHIRL® agitation that made conventional circulating sys­ tems obsolete. Quality-built — easily the finest baths you can buy!

ENVIRONMENTAL CHAMBERS Acknowledged as the finest ever built for controlling tem­ perature and humidity. For testing to MIL, and even tough­ er in-house specs. Starting with economical jar-type cham­ ber for the most modest bud­ get, models include unique air-cooled design . . . mechan­ ically refrigerated steady-state units . . . high temperature/humidity chambers.

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For full information, contact: Blue M, A Unit of General Signal; Blue Island, Illinois 60406. Telephone: (312) 385-9000.

BLUE A U N I T OF G E N E R A L 710 A · ANALYTICAL CHEMISTRY, VOL. 55, NO. 7, JUNE 1983

M SIGNAL