Beckman® INSTRUMENTS, INC

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Got a pH proMem? Chances are we've solved it. The answer you need to your most perplexing pH measurement problem is probably already on file with Beckman...the pH experts. In our nearly 40 years in the pH business we've come up against some sticklers: pure water, tris buffers, hard-to-reach samples. So we've put out three new Futura* combination electrodes that can handle just about anything you come up with. They're equal to or better than any other made. They're 9-inch ceramic reference-junction units that operate from -5°C to 100°C and feature Beckman's exclusive Keeper *•'Cable, the removable and reusable lead. Shown left to right are a fastresponse, low-resistance 10-mmdiameter model for the 0-11 pH range; another version with slightly lower response for the 0-14 pH range; and the fastresponse, low-resistance model for the 0-11 pH range with a pencil-thin 5-mm diameter. Whatever your specialized applications, you can choose from hundreds of other electrodes in the broadest line available, including pH (glass), reference, pH combination, Selection,* metallic combination, and metallic. And you can choose from an equally broad line of accessories and supplies. Remember, too, that you get on-call backup from the largest and most experienced sales and service organization in pH. Write for our complete catalog. Scientific Instruments Division, 2500 Harbor Blvd., Fullerton, California 92634. Beckman® INSTRUMENTS,

INC.

CIRCLE 31 ON READER SERVICE CARD 1208 A

ANALYTICAL CHEMISTRY, VOL. 45, NO. 14, DECEMBER

1973