Aquarium Testing Equipment

Control algae like a pro

Marine Algae Management Kit

NEW for saltwater aquariums! Start testing right out of the box with this ready-to-use kit. Perfect for beginners and experienced hobbyists alike, easily monitor phosphate and nitrate with digital results.

SHOP NEW KIT

Keep coral vibrant and strong

Marine Coral Care Kit

Meet our most recent addition to our Marine Line! Tend to your coral and create a healthy reef tank environment with this complete kit. Test calcium, alkalinity, and magnesium and attain digital readouts.

SHOP NEW KIT

Shop all reagents

Hear from reef tank owners

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Digital read-out

"So simple and accurate. Why do it old school?"
- Jerry B., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Super easy to use

"I love the fact that it gives an exact measurement without having to guess the shades of colors!"
- Tammy K., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
A must-have

"If you are really looking for reliable numbers, you need to get this Checker; I highly recommend it."
- Charles W., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Finally no doubt

"I know that pH testing is simple, but choosing between those colors is just a pain and you are never really sure. Now I am. Best $$$ I ever spent."
- Robert D., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Absolute masterpiece

"With this new Nitrate High Range Checker, getting Nitrate readings for my reef tank is a breeze. As with all Hanna Instruments Checkers, they are a thousand times better by having a digital reading over those color matching test kits. Thanks Hanna for the great checker!"
- Tony P., Verified Buyer

$Digital Refractometer for Brewing - HI96841$ ⭐⭐⭐⭐⭐
Quick and accurate

"Thanks so much for making testing fast and for giving me a better and more accurate reading! Love, love, love your products!"
- Angelica Q., Verified Buyer