Disabled readings despite calibration test factory

Bought for ongoing review of our treated with ion exchange softening tap water, the conductivity meter on the Amazon Marketplace. My choice fell on the Hanna DIST 3 because the device compared to similar competitive products that cost sometimes only half, has long been on the market and has performed well in various aquariums forums.

The new device were hand-written forms Kalibriermessdaten a logged target-deviation of about 2% at. My other hand sample measurements showed deviations of more than 80%, that is completely disabled readings. Recalibration (acc.Manufacturer about + -. 10%) is not possible with such deviations.

Have returned the defective unit. The unwinding went Amazon typical problems.

My advice: Do not trust the manufacturer's Kalibriermessdaten but compare as First conductance of the local water supplier with the display value of the device. If necessary, same calibration mitkaufen (costs currently leider extra postage because shipping only by Amazon directly). In the alternative, 0.1% saline solution mix: When using non-conductive water, measured value of roughly 1500 microS / cm should adjust.