Myron L TH1 - Manual (Page 5)

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I. INTRODUCTION
Thank you for selecting the feature-packed TechPro II™, one of the
Myron L Company’s latest in an increasing line of instruments utilizing
advanced microprocessor-based circuitry and SMT manufacturing
processes. This circuitry makes the instrument extremely accurate,
reliable and very easy to use.
The TechPro II incorporates several new features including: waterproof
enclosure, keypad calibration, FULL 4 digit LCD, the addition of a 20
location memory storage, and enhanced performance to name just some
of the improvements. Additionally, “salinity” units may be selected. See
Features and Specifications on pages 2 & 3.
For your convenience, on the bottom side of your TechPro II is a brief
set of instructions.
Special note ... For the TPH1 & TP1 models, conductivity and TDS
require mathematical correction to 25°C values (ref. Temperature
Compensation, pg. 25). On the left of the TechPro II’s liquid crystal
display is shown an indicator of the salt solution characteristic used to
model temperature compensation (Tempco) of conductivity and its TDS
conversion. The indicator may be KCl, NaCl, or 442™. Selection affects
the temperature correction of conductivity, and the calculation of TDS
from compensated conductivity (ref. Conductivity Conversion to Total
Dissolved Solids (TDS), pg. 28).
The selection can affect the reported conductivity of hot or cold solutions,
and will change the reported TDS of a solution. Generally, using KCl
for conductivity, and 442™ (Natural Water characteristic) for TDS will
reflect present industry practice for standardization. This is how your
instrument, as shipped from the factory, is set to operate. For use in sea
water desalination for example, both the CONDuctivity and TDS may
easily be changed to NaCl.