PHOTOVOLT
Electronic
pH
METERS
A complete Une of pH meters incorporating modern electronic tubes and circuits, simple in operation and maintenance, featuring sealed amplifier plug-in units. .Line-Operated Model 85
,
' • S i n g l e range 0-14, scale length 3'Vreadable to 0.1 pH unit.; • Fully-stabilized, simple, compact, available with carrying case. ii · · Afull-fledged pH meter usable with all types of electrodes.' :
Write.for Bulletin # 1 9 5 Line-Operated Model 115
^^Ηΐ'='$ΐΐ5·ΤΓ7'1;
• S i n g l e range0-14, 'scale length 4 " , readable to 0.05 pH unit. • Temperature control 20-60°C, available with carrying case. •""•',· Additional millivolt scale* for redox measurements and titrations. Write for Bulletin # 2 2 5 $145.—
Line-Operated Model 1 1 0 . , ' MODEL 85
.
«;
MODEL 110
*':'[
I , · , Single-range 0-14, scale length 7 " , readable r o : 0 . 0 2 # H unit., ^•.'Temperature control 0-100°C, vojtage^selector for 80-260 volts. ·' Available with carrying cover & basehoàrd for bottles; beakers. >;'
Write for Bulletin #105 /'• ^ffînPHS@^Bffl •Battery-Operated'ModeÎ.125'gpf|;^v,;. • S i n g l e range 0-14, scale length SVi", readable to 0.03 pH unit. . T/.Only 3 batteries, standard radio type, 2,000 hours of service. • A v a i l a b l e with carrying frame for instrument, beakers; Eôttles.,.·
Write for Bulletin # 1 1 8
$175.
All prices, include, set of. gloss electrode and calomel electrode, . or combination glass-and-calomel .electrode -(probe)." •< Γ 1 ;
MODEL 125.
See afso Bulletin # 738 on pH Meter Tester Mod. 25 for checking the performance of pH meters without electrodes or buffers, applicable to pH meters of any make. $ 5 8 .
M O D E L 115
PHOTOVOLT
C O R Ρ Ο R A T I O N
95 M A D I S O N A V E N U E , Ν . Υ. 16. Ν . Υ.
Circle Nos. 31-1, 31-2, 31-3, 31-4, 31-5 on Readers' Service Card
No. 6
of the
ADVANCES CHEMISTRY SERIES
IN
AZEOTROPIC DATA 41-page formula index 247-page
table of
1 0 7 charts . .
binary systems
17-page table of ternary systems
329 pages- • ·• American Chemical Society
1 14 A
cloth bound Special Issue Sales
INDUSTRIAL A N D ENGINEERING CHEMISTRY
$5 0 0 per copy 1155 16th St., N . W . , Washinston 6, D. C.
