Model : 250
   A multimeter for electrochemical analysis!
    The Model 250 provides the easiest, most accurate     measurements available, combining a research-grade     pH meter, ion meter and conductivity meter in one!
Model : 225
    The perfect meter for ion-selective analyses, plus pH,     mV and probe
    Three electrode inputs
     Simultaneous one, two or three channel measurements      Direct and indirect ISE readouts
     Direct reading with glass or FET electrodes
Model : 220
    Research-grade pH and conductivity measurements in     one meter
    Simultaneous pH and conductivity measurements, even     in the same solution!
    Offers conductivity, NaCl salinity, practical salinity,     resistivity and Total Dissolved Solids
    Improved conductivity measurements with 4-cell     conductivity and multiple standards
    Three electrode inputs
    Replatinizing circuit for renewing your conductivity cells
    Fully compliant with the new USP 23 conductivity     protocol
    Standardizes in all conductivity modes
Model : 215
   The Model 215 offers the most accurate pH     measurements available.
    Reliable and affordable research-grade pH     measurements.
    Accuracy to 0.002 pH units
    Automatic recognition of 22 different buffers
    Five custom user-entered buffers
    Automatic electrode checking
    Graphical display of electrode calibration curve
    Built-in context-sensitive help  
 

Model : 250  Mode

Ion

ph

mV

Ranges

1.00 x10^-9 to 9.99 x 10⁹

-2.000 to 20.000

?800.0

Resolution

1, 2, 3 significant digits

0.001/0.01/0.1

0.1/1

Relative Accuracy

?0.17n%

?.002

?.1

Temperature Measurement

-5.0 to 105¡É; relative accuracy, ?.3¡É

Temperature Compensation

Manual
Automatic, -5.0 to 105¡É

Slope Control

Automatic 90 to 105%, Manual 80 to 110%

Environmental Conditions

15¡Éto 40¡É, 0 to 90% Relative Humidity

Conductivity Range

0 to 300,000µS

Relative Accuracy

0.5% of reading

Salinity Ranges

Autoranging, 0.01 to 70ppt NaCl equivalent salinity
Autoranging, 0.01 to 42ppt practical salinity

Resistivity

30ohm•cm to 1, 10 or 20megohm•cm (at cell constants of
10, 1, 0.5cm-1 respectively). Autoranging units; readout in ohm•cm, kilohm•cm, or megohm•cm. Fixed units: kilohm•cm

Total Dissolved Solids

0.005 to 1.5x10⁵ mg/L (at 0.5 solids factor, depending on cell constant)

Temp Coefficient

Software configurable; Off or On 0 to 4%/°C

Power Requirements

115V 50/60Hz (Additional voltages available)

   Model : 225

Ranges

1.00 x 10^-9 to 9.99 x 10⁹

-2.000 to 20.000

?800.0

Resolution
significant digits

1, 2 or 3

0.1/0.01/0.001

1/0.1

Accuracy

?0.17n%

?.002

?0.1

Temperature
Compensation

Automatic or manual, from -5¡Éto 105¡É

Slope Control

Automatic, 90 to 105%, manual, 80 to 110%

Environmental
Conditions

15?to 40°C, 0 to 90% (noncondensing) Relative Humidity

Power
Requirements

115V 50/60Hz (Additional voltages available)

Meter with kit includes

Meter, power supply, high performance glass-body pH/ATC "3-in-1" electrode, electrode arm and operation manual.

The Meter only includes

Meter, power supply, electrode arm and operation manual.

   Model : 215

Range

-2.000 to 20.000

?800.0

Resolution

0.001/0.01/0.1

0.1/1

Accuracy

?.002

?.1

Temperature
Compensation

Automatic & manual:-5 to 105¡É

Slope Control

Automatic, 90 to 105%
Manual, 80 to 110%

Environmental
Conditions

15 to 40¡É, humidity from 0 to 90% (noncondensing)

Power Requirements

115V 50/60Hz (Additional voltages available)

Meter with kit includes

Meter, power supply, high performance glass-body pH/ATC
combination electrode, electrode arm and operation manual.

Meter only includes:

Meter, power supply, electrode arm and operation manual

   Model : 220

Range

-2.000 to 20.000

?800.0

Resolution

0.1/0.01/0.001

1/0.1

Accuracy

?.002

?.1

Automatic Temperature
Compensation

Automatic or manual from -5 to 105¡É.

Slope Control

Automatic 90 to 105% Manual, 80 to 110%

Environmental
Conditions

15?to 40¡É, 0-90% RH

Power Requirements

115V 50/60Hz (Additional voltages available)

Meter with kit includes:

Meter, power supply, high performance glass-bodypH/ATC "3-in-1" electrode, electrode arm and operation manual.

Meter only includes

Meter, power supply, electrode arm and operation manual.

Conductivity
Range

0.01 to 3 x 105 µS/cm (depending on cell constant)

Resolution

1, 2 or 3 significant figures

Accuracy

?0.5% of reading

NaCl Equivalent Salinity   

Autoranging, 0.01 to 70ppt

Practical Salinity

Autoranging, 0.01 to 42ppt

Resistivity

Autoranging, 30 ohm•cm to 20 Megohm•cm (depending on cell constant)

Temperature Correction

Off or On, 0 to 4%/°C

Excitation Frequency

225 Hz

Replatinizing Circuit

2.5V, open circuit; 7.5mA, short circuit