IAN S NEW 7401 pH INDICATOR

Making pH and redox measurements? Want the ultimate in convenience and ease of operation? Then you'll welcome L&N's new 7401 pH Indicator. Offering the latest in modern design, this new, rugged, metal-case instrument provides: • Modern sloping-front panel for easy operation • A large 7" mirrored meter for maximum readability • Rotary-type controls for maximum convenience of setability • A terminal board on the back of the indicator for quick connections of e lec t rodes, recorder , range-change resistor and ground.

And the 7401 pH Indicator offers the time-proven stabilized feedback measur­ing circuit developed by L&N and widely accepted by laboratories. LIST NO.—7401-A1 Assembly includes 7401 pH Ind ica tor wi th e lec t rodes, holder, buffer, KCL.

Ranges Oto 14 pH 0 to ± 700 mv 0 to ± 1400 mv Scale Div. 0.1 pH 10 mv 10 mv Readability 0.02 pH 1.0 mv 2.0 mv Reproduc­ibility 0.02 pH 1.0 mv 2.0 mv Limits of Error: Meter Ind. Recorder Output

±0.07pH*

± 0.035 p H "

± 5 mv

±1.75mv

± 10 mv

±3.5mv

*± 0.03 pH when using careful measuring techniques. **±0.02 pH when using careful measuring techniques.

CASE—Metal, 11" (w) χ 8M>" (d) χ 9" (h). Wt.: 13 lbs. Operates on 120 v, 50-60 ~.

PRICE- $330.00 (subject to change with out notice). Specify List No. 7401-A1 (includes indicator, electrodes, holder, chemicals) when order ing.

Pioneers in Precision

LEEDS & NORTHUP 4 9 0 6 S T E N T O N A V E N U E ' P H I L A . 4 4 , PA

Circle No. 17 on Readers' Service Card

Hew Mm-hlriiJuyauM 27 ma item* get qwi copy!

Ace Mini-Lab is truly the small econo­my size: it takes up less space, con­siderable saving in reagent chemicals is effected and the good design of Ace Mini-Lab will facilitate your work. Mini-Lab is the first especially de­signed and fully developed line of miniature glassware. It has been en­thusiastically accepted in laboratories, in schools, everywhere. It is versatile, comes in f 14 /20 and i 18 /9 joints, and features a full line of component parts permitting endless variations. For the small economy size, try Ace Mini-Lab. The excellent design, the fact that the reduction in size has been accomplished without reduction in use­fulness, will make Ace Mini-Lab the most satisfactory miniature glassware you have ever worked with.

New Mini-Lab Brochure just oui! Wr i te Dept. A for your copy!

Circle No. 24 on Readers' Service Card

VOL. 34, NO. 13, DECEMBER 1962 . 1 1 7 A

ACE GLASS I N C O R P O R A T E D

Louisville, Ky., Vineland N. J. Springfield, Mass.