Water Quality Testers

(495 results)
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4191)
$76.49 - $280.49
Enjoy Free Same-day delivery!
Top Fin® Large Power Filter Cartridges
(274)
$27.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Pre-Conditioned Aquarium Water
2 sizes
(222)
$19.99
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
Enjoy Free Same-day delivery!
+ 1 more
Top Fin® All-In-One Betta Aquarium Starter Kit - 3 Gallon
(417)
$50.99
$59.99
Enjoy Free Same-day delivery!
Top Fin® Silenstream™ Small Filter Cartridges
(63)
$19.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Fascinate Column Starter Kit
(304)
$101.99
$119.99
Enjoy Free Same-day delivery!
Top Fin® Aquarium Hinged Glass Lid
7 sizes
(192)
$17.99 - $59.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(227)
$11.99 - $27.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(367)
$11.99 - $27.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Compact Aquarium Heater
3 sizes
(469)
$27.99 - $42.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1485)
$25.99 - $79.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Premium Aquarium Gravel - Classic Beach
(64)
$8.49
$9.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$8.49 - $30.59
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$11.99
Save 35% On Your First Autoship Order!
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)
$6.99 - $11.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Aquarium Sponge Filter
3 sizes
(202)
$11.99 - $23.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Floating Glass Aquarium Thermometer
(238)
$4.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Fine Mesh Fish Net
(108)
$4.99
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Aquarium Water Conditioner
3 sizes
(239)
$7.99 - $17.99
Save 35% On Your First Autoship Order!
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)
$140.24
$164.99
Enjoy Free Same-day delivery!
Top Fin® Silenstream™ Large Filter Cartridges
(135)
$19.99
Save 35% On Your First Autoship Order!
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)
$93.49
$109.99
Enjoy Free Same-day delivery!
Top Fin® Internal Filter Cartridges
(30)
$10.99
Save 35% On Your First Autoship Order!
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)
$63.74
$74.99
Enjoy Free Same-day delivery!
Top Fin® CN-S Corner Filter Cartridges
2 sizes
(48)
$10.99 - $19.99
Save 35% On Your First Autoship Order!
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)
$76.49
$89.99
Enjoy Free Same-day delivery!
Top Fin® Custom Colorflow™ Aquarium with 7 Color-Changing LEDs
3 sizes
(1373)
$57.79 - $84.99
Enjoy Free Same-day delivery!
Top Fin® Half Moon Aquarium - 3.5 Gallon
(2066)
$50.99
$59.99
Enjoy Free Same-day delivery!
Top Fin® Premium Glass Aquarium - 5 Gallon
(1566)
$76.49
$89.99
Enjoy Free Same-day delivery!
Top Fin® Aquarium Gravel - Midnight Black
2 sizes
(2)
$8.49 - $29.74
Enjoy Free Same-day delivery!
Enjoy Free Shipping On Orders $49+.
Top Fin® Retreat™ RF-L Filter Cartridges
(107)
$19.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Bowfront Betta Duo Aquarium - 2.5 Gallon
(1115)
$38.24
$44.99
Enjoy Free Same-day delivery!
Top Fin® Mystic Oak Finish Aquarium Stand
3 sizes
(42)
$59.49 - $144.49
Enjoy Free Same-day delivery!
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. ...
  7. 13
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.