I use the AP one until I buy a monitor... at $16.99 it lasts about 6 months testing 2 - 3 times a week... and is accurate to +/- 20ppm... I have compared my results to Seachem's much more elaborate, (and expensive) kits, and found it to be bang on... just my 2 bits...
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135G Mixed Reef. Bullet 2, 25 gal refugium, 2 X250W MH + 4X 96W PC\'s, DIY Calcium Reactor, Coralife 1/6 HP Chiller, Phosban, Tunze, 2 closed loops & SQWD\'s, Seios, Coralife 4 stage RO/DI & a bunch of other expensive gadgets... I may never retire, but I'm gonnahavahelluvanaquarium!
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