AD11 and AD12 are the most advanced microprocessor based IP67 Waterproof pH/Temp pocket testers in the market. 

 

Fast, stable and precise these testers are for users that require the greatest accuracy. Simple user-replaceable pH/Temp probe: just unscrew the plastic ring on the top of the electrode and replace it with a new one! 

 

2 rows display LCD (reads both pH and temperature measurements) and built-in HOLD function that freezes the display for easy and accurate recording. Other features such as stability indicator, automatic calibration and automatic temperature compensation make these waterproof pocket testers a must-have in a variety of industries. 

 

General problems, solutions

• make sure the batteries are inserted correctly (if it doesn't turn on)
• if the instrument cannot be calibrated, the error can also be caused by an air bubble trapped between the probes, which can be removed by moving the probe ("knocking")
• a common problem is that the Dutchman that clamps the probe is not tightened enough, thus the seal is not suitable and the instrument may get wet, which leads to loss of warranty
• the silicone protective cap (which contains the storage fluid) can be used for storage (not the gray plastic)

 

The modular design allows to replace the electrode in a fast and simple way.

 

 

ATTENTION!

Never immerse probe in high concentration acid or alkaline (undiluted pH minus liquid)!

Never immerse probe in hot liquids, because this may damage the probe.

Air bubble in probe does not cause any problems, because holding the instrument during measurement will cause the bubble to rise up, and stay away from the sensor.