442™: Your PoolMeter™ has been
factory calibrated with the TDS 442 Standard
Solution. The 442 Standard Solutions consist
of the following salt ratios: 40% sodium
sulfate, 40% sodium bicarbonate, and 20%
sodium chloride. This salt ratio has
conductivity characteristics closely
matching natural waters and was developed by
the Myron L® Company over four decades ago.
Sodium Chloride: For every ppm 442
Standard Solution, there is a ppm sodium
chloride (NaCl) solution which will have the
same conductivity. The parts per million of
the equivalent NaCl solution is on each
Standard Solution label. Instruments
calibrated to NaCl standards are set using
equivalent NaCl values.
All Myron L®
Company Standard Solutions are traceable to
the National Institute of Standards and
Technology (NIST) and are within 1.00% of
reference solutions. The concentrations of
the reference solutions are calculated from
data in the International Critical Tables,
All Myron L®
conductivity Standard Solution bottle labels
show three values: ppm 442, ppm sodium
chloride, and conductivity in micromhos.
RECOMMENDED STANDARD SOLUTION ppm 442™ and
442-30,000 (when used with RE-10)*
Specify quart (Q), gallon (G) or 2 oz.
RE-10 Range Extender is a useful accessory
for testing high conductivity/ppm solutions
beyond the normal range of your PoolMeter.
Inserting the RE-10 into a sample-filled
cell cup increases the maximum range ten
times. Use the Range Extender whenever the
reading is off the scale. Order model: RE-10
Carry Case for use with your Myron L®
PoolMeter, is foam-lined and molded of
sturdy ABS plastic. Order model: PTP