The sensor is guaranteed 6 months by GHL, if it happened that it ends before, it will be replaced free of charge.
Not having the new sensor, I cannot give my opinion on its lifespan.
The lifespan of the sensor is determined by various factors, water quality being the most important one. If the sample water contains high levels of organics and nutrients, the sensor may experience more wear. On the other hand, if the water quality is good, the sensor will see a lengthier life. The frequency of tests performed also play a role in the lifespan of the probe.
To put it into perspective, if one tests 500 times with “dirtier” water compared to 500 times with “cleaner” water, the lifespan of the sensor will not be the same.
Nonetheless, the minimum 6 month period still applies.
Gaël