Review on Horiba Potassium LAQUAtwin Pocket Tester by Logan Tripp

The product does not work systematically. I had the old version and it was great. When the replacement of the sensor was discontinued, I opted for this new model. It's hard to know if it's properly calibrated. So I'm not sure about the testimony. I won't even change the sensor. In less than a year it seems to have gotten worse. When I try to calibrate I get error messages. I have the feeling that I have a defective sensor.