OK, here is what an old lab rat that used a pH meter daily as one of his tools has to say about it.

1. The "special" storage solution is potassium chloride. This resores the potassium ions inside the probe.

2. I think that continuous use is a problem. The reason is that a film will develop over the electrode preventing it from operating properly. I suppose this can be overcome by VERY routine cleaning. I think that continuous use would eventually deplete the potassium ion in the electrode and thus shorten the life expectancy of the electrode.

3. We always calibrated our meters on a daily basis.

4. Electrodes should be cleaned with RO or distilled water after use, but never stored in RO or distilled water.

5. Small pocket sized pH meters (similar to TDS meters) are available. I have one. Another alternative are test strips, but I am not sure whether they are available in salt water pH ranges. The ones I used were 0-14, but I know theat more specific ranges are available. I will do some checking to see if a sea water range
(7.5 -9.0) test strip is availabe.

Gary