No. 5 I of the
ADVANCES IN CHEMISTRY SERIES PROGRESS IN PETROLEUM TECHNOLOGY
Fluid H y d r o f o r m i n g . . . . Isomerization . . . . Synthesis of L i q u i d Fuels from Natural Gas . . . . Composition of Petroleum . . . Synthetic Detergents from Petroleum . . . . A l i p h a t i c Chemicals . . . . Elastomers-and Plastics . . . . A n d 2 4 O t h e r Topics 393 pages . .
cloth bound . . . . $6.50 per copy American Chemical Society, Special Issue Sales, 1155 16th St., N . W . , Washington 6, D. C.
PHOTOVOLT
Electronic
p H METERS
A complete line of pH meters incorporating modern electronic tubes and circuits, simple In operation and maintenance, featuring sealed amplifier plug-in units.
Dnè-Ôperateci"Modeï 8 5 \ • Single range 0-14, scale length 3", readable to 0.1 pH unit. • Fully stabilized, simple, compact, available with carrying case. • A full-fledged pH meter usable with all types of electrodes. Write for Bulletin # 1 9 5
$105.
Line-Operated M o d e l 1 1 5 • Single range 0-14, scale length 4 " , readable to 0.05 pH unit. • Temperature control 20-60°C, available with carrying case.
MODEL 110
• Additional millivolt scale for redox measurements and titrations.:
Write for Bulletin # 2 2 5 Line-Operated M o d e l 1 1 0 MODEL 8 5
$130.—·
• Single range 0-14, scale length 7", readable to 0.02 pH unit. • Temperature control 0-100°C, voltage selector for 80-260 volts. • Available with carrying cover & baseboard for bottles, beakers.. : W r i t e f o r Bulletin # 1 0 5
$200.—
Battery-Operated M o d e l 125 • Single range 0-14, scale length 5Vi", readable to 0.03 pH unit. • Only 3 batteries, standard radio type, 2,000 hours of service. . · Available with carrying frame for instrument, beakers/bottles.
Write for Bulletin # 1 1 8
$160.-—
M O D E L 125
Atl prices include set of glass electrode and calomel electrode. With combination glass-and-calome! electrode (probe), additional price $3.00.
See also Bulletin # 138 on pH Meter Tester Mod. 25 for checking the performance of pH meters without electrodes or buffers, applicable to pH meters of any make.
M O D E L 115
44
A
PHOTOVOLT
INDUSTRIAL AND ENGINEERING CHEMISTRY
C O R P O R A T I O N 95 M A D I S O N A V E N U E . N . Y . 1 6 , Ν . Υ .
