PHOTOVOLT CORP

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PHOTOVOLT Electronic pH METERS

A complete line of pH meters, incorporating permanently fric· tionless taut-suspension indicating meters, modern electronic tubes and c i r c u i t s . Simple in operation and maintenance; featuring sealed amplifier plug-in units.

High Precision pH Meter Model 110

Two-way pH Meter Model 85 • Single range 0-14, scale length 3", readable to 0.05 pH Unit. • Available— compact battery pack for field use ($38.00 addtl.). • Fully stabilized, simple, usable with all types of electrodes. Write for Bulletin #195

• 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 — carrying cover and baseboard for bottles, beakers. Write for Bulletin #105

$135

$265 Standard Laboratory pH Meter Model 115

Portable pH Meter Model 125

• Single range 0-14, scale length 4", readable to 0.05 pH unit. • Temperature control 20-100° C, available with carrying case. • Additional millivolt scale for redox measurements and titrations. Write for Bulletin #225

• Single range 0-14, scale length 5V2", readable to 0.03 pH unit. • Only 3 batteries, standard radio type, 2,000 hours of service. • Available — carrying frame for instrument, beakers, bottles. Write for Bulletin #118

$225

H75

P H O T O V O L T Tester Model 25 for Checking and Adjusting pH Meters A compact, inexpensive instrument without batteries; for checking performance of PH0TOVOLT and other pH meters. Requires neither electrodes nor buffers. Write for Bulletin #138 $78

C O R P O R A T I O N 1115 Broadway, New York ΙΟ, Ν. Υ.

Circle No. 143 on Readers' Service Card

PHOTOVOLT LINE-OPERATED MULTIPLIER

FLUORESCENCE METER model 5 4 0

LINEAR/LOG

RECORDER A versatile Linear-Log Servo-Recorder for general laboratory use

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High sensitivity... full scale for 0.001 microgram quinine sulphate Micro-fluorimetry... liquid volumes down to 1 ml Low blank readings... linear instrument response High sensitivity nephelometry... minute turbidities Fluorescence evaluation of powders, pastes, and solids; also foi spot-tests on filter paper without elution Selection of filters, interference filters, and sample holders Write for Bulletin No. 392 to:

VARICORD 4 3 • • • • • •

Multi-range, potential and current recorder. Choice of per cent transmission or absornartce indication in spectrophotometry. For gas chromatography by conductivity or ionization. True potentiometric input. 1 second pen speed — 1 0 millivolt full scale sensitivity. Output connector for integrating and telemetering. Wrife far Bulletin * H 3 0

PHOTOVOLT CORP. 1115 Broadway Also:

pH Meters,

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New York 10, Ν. Υ.

Colorimeters,

Densitometers

Circle No. 144 on Readers' Service Card

72 A

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ANALYTICAL CHEMISTRY

SS85

PHOTOVOLT CORP. 1115 B R O A D W A Y

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N E W YORK 1 0 , N.Y.

Also available: Densitometers • Photometers • Fluorescence Meters • oH Meters Circle No. 145 on Readers' Service Card