Are these accurate?

[Keaton]

http://cgi.ebay.com/Pinpoint-Salinity-Monitor-Reef-Aquarium-Refractometer_W0QQitemZ300268088229QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item300268088229&_trksid=p3286.c0.m14&_trkparms=72%3A1205|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3A50

Are they worth the money and if not anyone have any brand recommendations? Thanks.

 

[yote]

Here you go. http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4690+9957&pcatid=9957
A whole lot cheaper and is as accurate as it gets.

 

[ccCapt]

Both will work just as well, if both are properly calibrated. If you want to constantly monitor salinity, get the monitor. If you want to occasionally test, get the refractometer.