Sper Scientific 860031 pH - mV Bench-Top Meter - Manual (Page 35)

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Example 2:
Standard: 1.6 uS; Detected value: 2.1 uS
Adjustable range: ± 0.42 uS (2.1*20)
Although the measured value differs less than 20%, the 1.6
uS is still less than the 10% range limit (19.99*10%).
Therefore, the maximum input value is 2.00 uS.
CONDUCTIVITY PROBE CALIBRATION