massterpiece There are only two reasons why you would want the 21-490. 1. It offers more fori the money than any other single focusing mass spectrometer in existence. 2 . The money is only $18,500. What makes the 21Î-490 so special? Things like: high resolution at high sensitivity. Wider versatility of applications. Total ionization. Diiiect probe. An electron multiplier. Heated batch inlet. Modular electronics. All at no extra cost. Performance like: mass range of 12 to 1000. Resolution to 1100 (10% valley). Scan speeds to 1 sec/decade. A 4-inch, 90° sector analyzer. Readily convertible to the double focusing 21-491 with resolving power to 2500. CEC/ANALYTICAL INSTRUMENTS DIVISION So if you believe that advanced mass spectrometry is beyond your budget, we've got news for you. The 21-490. For all the facts call our nearest office or write Bell & Howell, Pasadena, California 91109. Ask for Bulletin Kit 3 3 4 0 - X 4 .
BELL & HOWELL
Circle No. 19 on Readers' Service Card
VOL. 4 1 , NO. 6. MAY 1969 · 111 A
