flinnsci.com APPARATUS PARAFILM® M
167
Pens
Chromatography Pens See page 127.
Sharpie® Felt Tip Pens
Pen permanently marks plastic, glass or paper. Markings are waterproof and can be
autoclaved. Ink dries quickly.
Catalog No. Description Color Price/Each
AP1297 Sharpie® Felt Tip Pens Black $ 2.74
AP9300 Assorted 14.46
Transparency Pens See page 96.
Parafilm® M
Simply the best temporary seal available! A thermoplastic, self-sealing, pliable, colorless
film that can be used to seal almost anything. Film will handle 24-hour exposure
to common acids, but is completely soluble in organic solvents. Available in rolls in
a dispenser carton.
Catalog No. Description Width Length Price/Each
AP1500 Parafilm® M 2" 250 ft. $33.63
AP1501 4" 125 ft. 29.95
AP1502 20" 50 ft. 66.38
Pencil Compass
Accurate circles up to 12" in diameter. Scale is divided into eighths of an inch. Locking
pencil holder with pencil included.
Catalog No. Description Price/Each
AP5356 Pencil Compass $2.53
Pencils
See details at flinnsci.com.
Catalog No. Description Color Price/Each Price/Pkg.
AP5895 Colored Pencils, Set of 12 Red, Erasable $14.51 —
FB0643 Assorted 10.00 —
AP6400 Prismacolor® Art Pencils,
24-Color Set
40.96 —
AP8291 Wax Pencil Black 1.46 $16.56/12
AP8292 Red 1.41 15.96/12
AP8469 Blue 1.41 15.96/12
AP5981 Wax Pencil Set, Heat-Resistant One Each (Red,
Blue, Black)
5.11 —
pH and mV Meters
Choosing a pH Meter that’s Right for You!
Flinn pH Meter Selection Chart for Science Teachers
Catalog No.
pH Meter
Model
pH Range &
Accuracy (±)
mV Range
& Resolution
Line- or Battery-
Operated
Type of
Readout
Temp.
Control
Combination
Electrode Price/Each
AP8673 Flinn -2.00–20.00
0.02
NA Battery (3 V)
Furnished
LCD NA Gel-Filled $ 52.00
AP8901 Oyster 0.00–14.00
0.02
-999–999
1.1
Battery (9 V)
Furnished
LCD Manual
or Auto
(0–100 °C)
Gel-Filled 280.57
AP7708 Portable pH
Meter Kit
0.00–14.00
0.02
-499–499
0.1
Battery
(4 AAA)
Furnished
LCD Manual
or Auto
(-5–80 °C)
Gel-Filled 369.80
AP7452 pH and
Conductivity
Meter,
Benchtop
0.00–14.00
0.02
±1999.9
0.1
AC Adapter LCD Manual
or Auto
(-5–80 °C)
Gel-Filled 475.00
AP9701 Flinn
Desktop
Digital pH
Meter
0.00–14.00
0.02
0–1999
1.0
AC Adapter LED Automatic
(0–100 °C)
Refillable 569.75
AP9702 Flinn
Benchtop
Touchscreen
pH Meter
-2.00–19.00
0.002
-1999–1999
0.1
AC Adapter LCD
Touchscreen
Automatic
(0–100 °C)
Refillable 709.50
AP7633 Advanced
pH Meter
Kit, Benchtop,
Orion
Star™
-2.00–16.00
0.1, 0.01
±1999.9 AC Adapter
(or 4 AA
Batteries)
LCD Automatic
(-5–105 °C)
Refillable 946.40
See free How to Store, Maintain and Calibrate pH Electrodes video at flinnsci.com.
pH meters are widely used in chemistry, biology and Earth and environmental
science experiments to provide more accurate and precise
pH measurements that can be obtained using indicators or pH paper.
The following guide will help you understand the terminology used to
describe pH meters and how to select a pH meter that’s right for you.
• The electrode is the most important part of the pH meter. All modern
pH meters feature an internal combination electrode—an ionselective
electrode permeable to H+ ions is combined internally with
a reference electrode. This lets the pH meter automatically convert
mV measurements to pH values.
• Electrodes are also the most sensitive and fragile element of a pH
meter. Gel-filled electrodes require almost no maintenance and
are generally more durable, especially for classroom or field use.
Refillable electrodes are more accurate and may have a longer life,
but they also require periodic maintenance to refill the electrode
body with the appropriate electrolyte solution.
• A pH meter is in essence a very sensitive voltmeter. An instrumentquality
pH meter allows readings of both mV and pH units. This
versatility allows the user to check the performance accuracy of
the electrode.
• The pH value of a solution depends on temperature. The effect is
small (0.003 pH units per degree Celsius). Modern, instrumentquality
pH meters feature automatic temperature compensation,
or ATC, which automatically corrects the pH reading for the actual
temperature by means of a temperature sensor built into the electrode.
Some pH meters also allow manual temperature correction.
See the following selection chart for the characteristics of pH
meters available from Flinn Scientific.
PARAFILM ® M—
A very handy item to have
in your laboratory.
Parafilm® M
AP1500, etc.
Pencil Compass
AP5356
Sharpie® Felt
Tip Pens
AP9300
pH METERS continued on next page.
/?type=All&defaultType=Products&query=AP1297
/?type=All&defaultType=Products&query=AP9300
/?type=All&defaultType=Products&query=AP5895
/?type=All&defaultType=Products&query=FB0643
/?type=All&defaultType=Products&query=AP6400
/?type=All&defaultType=Products&query=AP8291
/?type=All&defaultType=Products&query=AP8292
/?type=All&defaultType=Products&query=AP8469
/?type=All&defaultType=Products&query=AP5981
/?type=All&defaultType=Products&query=AP8673
/?type=All&defaultType=Products&query=AP8901
/?type=All&defaultType=Products&query=AP7708
/?type=All&defaultType=Products&query=AP7452
/?type=All&defaultType=Products&query=AP9701
/?type=All&defaultType=Products&query=AP9702
/?type=All&defaultType=Products&query=AP7633
/?type=All&defaultType=Products&query=AP1500
/?type=All&defaultType=Products&query=AP1501
/?type=All&defaultType=Products&query=AP1502
/?type=All&defaultType=Products&query=AP5356
/?type=All&defaultType=Products&query=AP1500
/?type=All&defaultType=Products&query=AP5356
/?type=All&defaultType=Products&query=AP9300
/flinnsci.com
/flinnsci.com
/flinnsci.com