STEP SYSTEMS Nitrachek 404 Operation Manual page 12

Results
If result > 500 mg/l NO3
If result < 5 mg/l NO3
3 measures per sample
Calcule the average of 3 measures.
Example : 294 , 278, 300. Average = 290 mg/l
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Check that the 3 measures are within limits of : and + 10 % of this average.
Verification +/- 10 % : 261 – 319
The 3 measures are in the range 261 - 319.
Average is valid.
If the juice had been diluted 1/10, content = 2900 mg/L NO3.