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New TN400 Turbidity Meter

Received a tn400 turbidimeter last week. Calibrates fine but will not measure real samples (tested raw and treated water) Always measures 0.00 or 0.03 Tested same samples repeatedly with 3 very accurate hach meters. They tested the samples uniformly. Raw tested 1.13 Treated tested 0.16 Calibrated TN400 5 or 6 times but still reads 0.00 or 0.03 This meter is brand new and was to be used as a spare. But it has never worked properly. Would appreciate a response Thank you-LYLE
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