American Marine Pinpoint Calcium monitor anyone use it ? worth it ?

[BruceK]

was looking at an American Marine Calcium monitor wanted to know if anyone has used it... is it accurate ?
Aquacave sells them

http://www.aquacave.com/Pinpoint-Calcium-Monitor-by-American-Marine-P1504.aspx

Bruce

 

[jrpark22000]

Not worth it in .02. I picked up a used one with a used probe then a new probe to validate my results. It need to be calibrated way too often to be accurate and takes a long time to settle during each test.