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Collection: Controllers & Testing

Testing and monitoring gear for freshwater and reef tanks: reagent kits, digital checkers, meters, probes, and automated controllers. Manual kits confirm a number; controllers watch it around the clock.

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265 products

API Freshwater Master Test Kit

Test Kit

API Freshwater Master Test Kit

5.0 out of 5 stars, 4 reviews
Regular price $47.15
Sale price $47.15 Regular price
Hanna Nitrate Checker Reagents - 25 Pack

Test Kit

Hanna Nitrate Checker Reagents - 25 Pack

4.5 out of 5 stars, 2 reviews
Regular price $26.95
Sale price $26.95 Regular price
Neptune Trident Reagent 6

Aquarium Monitor

Neptune Trident Reagent 6

4.0 out of 5 stars, 2 reviews
Regular price $159.99
Sale price $159.99 Regular price
Hanna Alkalinity Checker Reagents - 25 Pack

Test Kit

Hanna Alkalinity Checker Reagents - 25 Pack

4.0 out of 5 stars, 4 reviews
Regular price $17.95
Sale price $17.95 Regular price
API GH/KH Freshwater Test Kit

Test Kit

API GH/KH Freshwater Test Kit

5.0 out of 5 stars, 2 reviews
Regular price $15.60
Sale price $15.60 Regular price
Neptune Trident NP Reagent 2 Month Kit

Aquarium Monitor

Neptune Trident NP Reagent 2 Month Kit

5.0 out of 5 stars, 2 reviews
Regular price $84.99
Sale price $84.99 Regular price
Hanna Phosphate Checker Reagents

Test Kit

Hanna Phosphate Checker Reagents - 25 Pack

4.0 out of 5 stars, 2 reviews
Regular price $17.95
Sale price $17.95 Regular price
API Nitrate Test Kit

Test Kit

API Nitrate Test Kit

5.0 out of 5 stars, 1 review
Regular price $18.20
Sale price $18.20 Regular price
Salifert Alkalinity Test Kit

Test Kit

Salifert Alkalinity Test Kit

5.0 out of 5 stars, 1 review
Regular price $20.95
Sale price $20.95 Regular price
Hanna Phosphorus Checker Reagents - 25 Pack

Test Kit

Hanna Phosphorus Checker Reagents - 25 Pack

5.0 out of 5 stars, 2 reviews
Regular price $17.95
Sale price $17.95 Regular price
Salifert Magnesium Test Kit

Test Kit

Salifert Magnesium Test Kit

5.0 out of 5 stars, 2 reviews
Regular price $24.95
Sale price $24.95 Regular price
Salifert Calcium Test Kit

Test Kit

Salifert Calcium Test Kit

5.0 out of 5 stars, 4 reviews
Regular price $23.95
Sale price $23.95 Regular price
Salifert Nitrate Test Kit

Test Kit

Salifert Nitrate Test Kit

4.7 out of 5 stars, 3 reviews
Regular price $21.95
Sale price $21.95 Regular price
API Saltwater Master Test Kit

Test Kit

API Saltwater Master Test Kit

4.0 out of 5 stars, 1 review
Regular price $47.15
Sale price $47.15 Regular price
Salifert Phosphate Test Kit

Test Kit

Salifert Phosphate Test Kit

Regular price $24.95
Sale price $24.95 Regular price
AutoAqua Smart Doser 2

Controller Accessory

AutoAqua Smart Doser 2

5.0 out of 5 stars, 2 reviews
Regular price $231.65
Sale price $231.65 Regular price
Hanna Nitrate Checker

Test Kit

Hanna Nitrate Checker

5.0 out of 5 stars, 1 review
Regular price $77.95
Sale price $77.95 Regular price
Red Sea Marine Care Program Master Test Kit

Test Kit

Red Sea Marine Care Program Master Test Kit

5.0 out of 5 stars, 1 review
Regular price $115.99
Sale price $115.99 Regular price
API Ammonia Test Kit

Test Kit

API Ammonia Test Kit

Regular price $20.80
Sale price $20.80 Regular price
Salifert Ammonia Test Kit

Test Kit

Salifert Ammonia Test Kit

Regular price $17.95
Sale price $17.95 Regular price

You Can't Correct What You Haven't Measured

Stable water chemistry is the difference between a thriving tank and a stalled one. Testing tells you where you stand; monitors and controllers keep watch when you're not looking.

Levels of Testing and Control

  • Manual test kits — titration-based kits for periodic checks of the core parameters.
  • Digital checkers — handheld colorimeters that remove the guesswork of reading color charts.
  • Continuous monitors — pH, salinity, and temperature meters with calibration solutions.
  • Automation — controllers that log data and switch equipment on set conditions.

A simple community setup needs little more than a master kit. A demanding reef under active dosing earns its keep from digital checkers and a controller that reacts to a failure faster than you can. Choose the level that matches how much risk your livestock represents. Not sure which tier fits your tank? Email info@jlaquatics.com.

J&L Aquatics was formed in December 1997

Our business was started from our love of the aquarium hobby. We at J&L Aquatics felt that the Canadian aquarist should have the option to purchase top quality supplies, equipment and livestock other than the generally over priced local retail stores.