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