(4) The TDS meter is designed for use with water temperatures of 50°F (10°C) and above. If water being tested is
below 50°F, then reading obtained must be adjusted. Use water temperature along base of graph (Table 2-12)toobtain
the multiplier on the left side of the graph. Multiply reading by the multiplier obtained to correct the reading for
temperature. (Example: 35°F = 1.08 multiplier, 41°F = 1.05 multiplier.)
Table 2-12. TDS Temperature Graph
b. Pre-Operation Check Out.
(1) Before operating TDS meter make sure cell cup (3) is clean.
If internal standard reading cannot be obtained by the methods below, including
battery change, do not use the unit.
The internal standard will vary from meter to meter.
(2) TDS meter should read the same as the internal standard reading (1, Figure 2-18) stamped on back of meter.
Figure 2-18. Bottom View of Portable TDS Meter