Before you drop it once, we've dropped our new pH electrode 10 times. Not that we're accident-prone . . . dropping our new pH electrode is one way of verifying its ruggedness. And we've combined this ruggedness w i t h outstanding stability, by making the internal element of packed calomel. This not only yields more mass—for voltage and thermal stability—but also prolongs electrode life. The new Leeds & Northrup electrode has many other things to recommend i t . . . Π It's internally shielded, to eliminate pick-up effects. D Sodium-ion error is extremely low. Π Its pH range is 0 to 14 pH. Π It has a broad temperature range—from 10 to 90 C. (It may even be used intermittently to 100 C.) And of course, as with all L&N pH electrodes, it's guaranteed against operating defects for one year. For more information and the name of the pH dealer nearest you, write to Leeds & Northrup, North Wales, Pa. 19454. We've got the drop on pH electrodes.
LEEDS & NORTHRUP Pioneers in Precision Subsidiaries in Canada, Mexico, England, Italy, Agents throughout the world. Circle No. 132 on Readers' Service Card
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ANALYTICAL CHEMISTRY
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