A complete line of pH meters incorporating modern electronic tubes and circuits, simple in operation and maintenance, featuring sealed amplitier plug-in units.
Line-Operated Model 115 • • -
Single range 0-14 scale length 4 " , accuracy 0.05 pH unit. Fully stabilized for wide range of line voltage fluctuations. Unprecedented in compactness and low price of only
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Line-Operated Model 110 Single rangs 0-14, scale length 7", accuracy 0.02 pH unit. Available also with shielded compartment, w i t h base board and carrying hood, with bottle* and beakers, additional price $60.—.
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Battery-Operated Model 125 • • • •
Single length ovi 5 Va , accuracy single range range 0-14. u-14. sea sea Ιluυ length accuracy 0.03 0.03 pH pH unit, t service. Only 3 batteries, standard radio type, 2,000 hours of sei ,,-j'ce S 2 0 . - . Carrying fromt: for instrument, beakers, and bottle»,, pri< •Iternative operation Stabilized powor supply unit available for alternative from 110 volt AC line, price S48
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Battery-Operated Model 125-B for Blood pH • •
Scale Icncjlh ΐ'\' . expanded five-fold for blood pH tests. Accuracy 0.01 in pH 6-8 range. 0.05 in pH 2-12 range.
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See also Bulletin # 1 3 8 on pH Meter Tester Mod. 25 for checking the of pH meters without electrodes or buffers, applicable
MODEL 125-B performance
to pH meters of any make.
C O R P O R A T I O N 95 MADISON AVENUE. N. Y. 16. Ν. Υ.
For further information, circle number 75 A-1 on Readers' Service Card, page 73 A
PHOTOVOLT Densitometer for Partition Chromatography and Paper Electrophoresis
A photoelectric precision instrument for the rapid and convenient evaluation of strips and sheets of filter paper in partition chromatography and paper electrophoresis. Write for Bulletin
PHOTOVOLT CORP. 95 Madison Avenue
New York 16, Ν. Υ.
Also Colorimeters Fluprimeters Nephelometers
pH meters Reflection Meters Glossmeters
Electronic Photometers Multiplier Photometers Interference Filters
Circle No. 75 A-2 on Readers' Service Card, page 73 A
2 8, N O . 1 0 , O C T O B E R
P H O T O V O L T Line-Operated Multiplier FLUORESCENCE METER Mod. 540
• High-sensitivity for measurement of low concentrations (fullscale for 0.001 microgram quinine sulphate) • Micro-fluorimetry with liquid volumes as low as 1 ml • Low blank readings, strict linearity of response • Universally applicable due to great variety of available filters, sample holders, and other accessories • Interference filters for high specificity and for determining spectral distribution of the fluorescence • High-sensitivity nephelometry for minute turbidities • Fluorescence evaluation of powders, pastes, and solids, also in spot-tests on filter paper without elution Write for Bulletin #392 to
PHOTOVOLT CORP. 95 Madison Ave.
New York 15, N . y .
Circle No. 75 A-3 on Readers' Service Card, page 73 A