V O L U M E 2 1, NO. 12, DECEMBER 1 9 4 9
35A
V e U - 4 L · AERATOR WORKS WONDERS with WATER velua-Vf-lo·
gives more suds from less soap
Soap + water + air = lather. So when a Velva-Flo stream with its millions of tiny air bubbles touches soap, it instantly forms a thick, creamy blanket of soap.
1/eloa-tf-lo·
streams can't splash
N o more soaking-wet uniforms, dresses or suits when you have Velva-Flo in your surgery, laboratory or home. A n ordinary stream splashes all over—Velva-Flo bubbles spread.
water tastes better Aeration reduces chlorine and other unpleasant odors and tastes. Velva-Flo bubbles escape immediately, leaving water crystalclear.
Veluo-fylo-
fits standard faucets
The aerator is 2-3/8" long and 1-3/8" in diameter. PRICE EACH Minimum order — package of 3 Aerators
89)i $2.67
S T A N D A R D SCIENTIFIC SUPPLY CORP. 34
W e s t
4th
Street
New
York
1 2,
Ν.
Υ
PHOTOVOLT Line-Operated
Electronic
PH
METER
A truly universal instrument •
for accurate p H readings in laboratory and factory use
•
for operation with any types and designs of electrodes
•
for p H tests, titration, and oxidation-reduction potentials
•
with 7 " scale from p H 0 t o 1 4 , without reversal or switching
•
fully stabilized, for A C lines 9 0 - 2 7 5 volts 5 0 - 6 0 cycles
•
for continuous
•
available with protective wooden housing for portability
•
furnished
with
operation, also adaptable for recording shielded
glass electrode, also
available
with shielded compartment for unshielded micro-electrodes
Hermetically sealed amplifier for permanently reliable service even in humid atmospheres. Minimum grid current for accurate measurement of non-aqueous samples including oils. Write
for 7-page descriptive
Bulletin #110
to
P H O T O V O L T CORP. 9 5 Madison A v e .
Also: Photoelectric Colorimeters and Fluorescence Meters, Reflection Meters, Densitometers, Electronic Photometers
New York 1 6 , Ν . Υ.
