Water Quality Testers

(555 results)
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4191)
$55.99 - $229.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Large Power Filter Cartridges
(274)
$17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Pre-Conditioned Aquarium Water
2 sizes
(222)
$16.79 - $16.99
Buy 1 Get the 2nd 25% Off Top Fin Food & Watercare (excludes Pond)
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 1 more
Top Fin® All-In-One Betta Aquarium Starter Kit - 3 Gallon
(417)
$52.99
$54.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Java Fern Live Plant
(38)
$5.39
$6.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Silenstream™ Small Filter Cartridges
(63)
$14.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(461)
$189.99
$194.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Fascinate Column Starter Kit
(304)
$86.99
$89.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Aquarium Hinged Glass Lid
7 sizes
(192)
$16.99 - $58.99
Buy any open glass tank, Get 20% off a glass hood
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(227)
$8.99 - $17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(367)
$8.99 - $17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Compact Aquarium Heater
3 sizes
(469)
$14.59 - $33.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1485)
$15.59 - $49.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Premium Aquarium Gravel - Classic Beach
(64)
$7.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$7.99 - $25.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Aquarium Airline Tubing
2 sizes
(96)
$4.99 - $7.69
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Aquarium Sponge Filter
3 sizes
(202)
$9.99 - $19.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Floating Glass Aquarium Thermometer
(238)
$3.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Anubias Frazeri Live Plant
(43)
$5.39
$6.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Anubias
3 sizes
(236)
$5.39 - $10.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Amazon Sword Live Plant
3 sizes 1 color
(165)
$5.39 - $12.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Fine Mesh Fish Net
(108)
$1.49
$2.49
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Aquarium Water Conditioner
3 sizes
(239)
$4.19 - $9.99
Buy 1 Get the 2nd 25% Off Top Fin Food & Watercare (excludes Pond)
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Captivate Starter Kit
(414)
$129.99
$134.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Aquarium Stand - 55 to 75 Gallon
(266)
$254.99
$299.99
Sign In & Enjoy Free Shipping Over $49
Top Fin® Aquarium Stand - 55 to 75 Gallon
(141)
$209.99
$299.99
Sign In & Enjoy Free Shipping Over $49
Top Fin® Silenstream™ Large Filter Cartridges
(135)
$14.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® 10 Gallon Angled Aquarium
(138)
$89.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Internal Filter Cartridges
(30)
$7.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Split Bowfront Aquarium - 5 Gallon
(756)
$49.99
$59.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® CN-S Corner Filter Cartridges
2 sizes
(48)
$8.99 - $14.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® 5 Gallon Shrimp & Plant Aquarium
(89)
$69.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Custom Colorflow™ Aquarium with 7 Color-Changing LEDs
3 sizes
(1373)
$48.07 - $69.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Half Moon Aquarium - 3.5 Gallon
(2066)
$39.99
$44.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Aquarium Stand - 20 to 37 Gallon
(139)
$152.99
$179.99
Sign In & Enjoy Free Shipping Over $49
Top Fin® Aquarium Stand - 20 to 37 Gallon
(124)
$152.99
$179.99
Sign In & Enjoy Free Shipping Over $49
Top Fin® Premium Glass Aquarium - 5 Gallon
(1566)
$69.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Aquarium Gravel - Midnight Black
2 sizes
(2)
$7.99 - $25.99
3X points (6% back in savings) on all aquatic gravel
Sign In & Enjoy Free Shipping Over $49
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Help your finned friends get the most out of life by testing their water quality often. Ensuring that the water they’re swimming around in is in good condition is essential for their health and wellbeing. PetSmart’s collection of water test kits and water quality testers will help your fish live their best life. Give them water they can thrive in with one of our water quality test strips or kits. 
At PetSmart, you’ll find easy aquarium test strips and complete water testing kits for both freshwater and saltwater fish tanks. Invest in a water quality tester to check pH levels and ammonia, as well as chlorine and chloramine, nitrites, nitrates, water hardness, and more. 
In addition to water quality testers and water test kits, PetSmart has everything else you need to give your fish the absolute best care, including:
And for all you new fish parents who are just getting started with your aquariums, we even offer aquarium starter kits and a full selection of aquarium products that make it easy to start and maintain a new aquarium.
PetSmart also offers convenient shopping with curbside or in-store pickup. Need something today? We have select items available for same-day delivery in most areas powered by DoorDash. For items you purchase frequently, PetSmart has Autoship that automatically delivers the items you want to your door as often as you’d like. Check the website to see what items are eligible.