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The meter directions say on how to change the EC/TDS conversion factor [conv] and the temp compensation coefficient beta
From measurement mode press and hold the power/mode button [with the 3/4 circle and line through it]until TEMP and the current temp unit are displayed on the lower LCD
Press the power/mode button again to show the current conversion factor E.G 0.50 CONV
Press the SET/HOLD button to change conversion factor
Press the power /mode button to show the current temperarture compensation coefficient
Press the set/hold to change the temp compensation limit
Press the power/mode button to return to the normal measuring mode.
Hope this helps
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