A good quality hydrometer is important to main optimal salinity. There is a wide range of choices for salinity. Many prefer a low salinity for fish only systems, around 1.018. If you plan on having liverock, corals, snails, shrimps, etc. It would be best to keep your salinity a little higher. The corals generally prefer 1.025, but you can compromise and run anything from 1.020 to 1.025. The most important thing is to keep consistent. You do not necessary have to get the most expensive tester on the market, even the low priced little SeaTest models will work. We would recommend having it compared to a Refractometer at your local pet shop so you can verify the results.

What do we use? We use the Refractometer for our systems. It allows us to quickly check the salinity in all of our systems and it's the most accurate method. We can also check salinity of incoming livestock, just 2 drops out of the fish bag and we have a reading.

	Pinpoint Salinity Monitor w/probe Code:PIN-SAL Price: $122.99 Rating: 4.33 Quantity in Basket: none
	Sybon HD Refractometer - FG100sa Code:REFRACT-HD Price: $49.99 Sorry, we are currently sold out of 'Sybon HD Refractometer - FG100sa'. Please check back later. Rating: 5.00 Quantity in Basket: none
	Replacement Flap for Sybon Refractometer Code:REFRACT-HD-FLAP Price: $4.95 Rating: none Quantity in Basket: none
	Replacement Plastic Pipette (3ml) - 2 pack - for refractometer Code:REFRACT-PP Price: $0.49 Rating: none Quantity in Basket: none
	HYDROMETER, AMMONITE Code:AL-600099 Price: $9.99 Rating: none Quantity in Basket: none
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	Milwaukee Digital Seawater Refractometer Code:MIL-MA887 Price: $139.99 Rating: 5.00 Quantity in Basket: none
	Premium Aquatics Heavy Duty Refractometer Code:REFRACT-PA-K Price: $44.99 Rating: none Quantity in Basket: none