1 Full Box of 25 Single Packs   HI70024P is a premium quality 35.00 ppt salinity calibration solution that is...

COPPER PROFI-TEST Copper can be present in tap water and in salt mixes. If the copper concentration is higher than...

50% OFF, these expire 6/2025, acutally probably good for another 6 months after that.   Silicate Test Silicate occurs especially...

HYDROS 9ft Sense Extension Cable   This 9ft long extension cable for HYDROS Sense Accessories for Control 2 and Control...

Six Pack of ICP Total Water Tests The Fauna Marin Reef ICP Total Test gives a quick, accurate, and easy...

Water temperature is an important factor in keeping tank inhabitants healthy. JBJ floating glass thermometer sticks on the inside of...

HI 758 Calcium Checker HC is supplied with 2 sample cuvettes and caps, reagents for 25 tests, (1)1.5V AAA battery,...

Power Supply – 24VDC 36W (PS-36-US) This 24VDC, 36W power supply is used with the FMM so that you can...

The pH and ORP probes are now double-junction as well so they hold calibration longer and have a longer lifespan...

The HI780-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Marine...

THE ULTIMATE MULTIPURPOSE FLUID-MONITORING DEVICE! The FMM (Fluid Monitoring Module) is a multi-purpose device that, with the help of various...

Red Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25oC/77 0F....

The HI731331 are the replacement glass cuvettes used with the HI96 series portable photometers and turbidity meters. Each cuvette has...

Half U Clips for Rope Leak (10pack)

Solenoid Valve (SV-1) This 24VDC powered, normally-closed (NC), solenoid valve has push-fit tubing input and outputs designed for standard 1/4″...

Sachets are sealed against light and air and are ideal for on-the-spot calibration. Simply open, insert the tester or electrode...

Controller Designed for Continuous-Duty Liquid Dosing Applications The HYDROS Sole is an aquarium controller hybrid with a heavy-duty liquid dosing...

HYDROS Minnow, Aquarium Monitoring with Twin Micro Dosing Pumps The HYDROS Minnow features two independent micro-liquid dosing pumps for precise...

The Control X10 is the ultimate HYDROS system controller with twin Drive ports, four Sense ports, a pH/ORP port, a...

An Apex monitored aquarium is a successful aquarium! Introducing the exciting all-new A3 Series of Apex controllers. From the Jr....

The PINPOINT pH Monitor" is in use by thousands of customers worldwide. This affordable unit remains the only full-time pH...

Get your replacement reagents for your HI781 Marine Nitrate Low Range Colorimeter today. These high-quality reagents are manufactured in our...

High sensitivity seawater nitrate test kit highly sensitive reagents professionally calibrated colour chart differentiated colour gradations precise sliding comparator sample...

Red Sea Nitrate Pro - Reagent Refill Kit

Salifert Potassium Reef TestPotassium concentration in natural seawater is approximately 400 ppm. Many aquarists have reported that a low potassium...

Sybon Heavy Duty Model is one of the most robust models available. You can feel the difference in weight by...

The Magnetic Optical Sensor replaces our optical sensor with magnet and offers an improved look, feel, and magnetic design that...

SALINITY/CONDUCTIVITY PROBE- LAB GRADE Start Measuring Salinity or Conductivity in your tank.  Get alerts when those values are out of...

Flow Sensor – 1″  (FS-100) Usually used with a return pump, this flow sensor can be placed in line with...

Thank you for choosing Pro-1 Normal Seawater Refractometer of Tropic Eden. In this instruction manual you will find clear information...

Protective Case for Milwaukee Refractometers

CoralVue HYDROS Sense Port Accessory   The HYDROS Flow Sensors are easy-to-install and measure the flow rate of water passing...

HYDROS Sense Port Accessory   Monitor your RO/DI units' water quality with HYDROS Dual Inline TDS Sensor. Plugs directly into...

The HI780 Checker HC (Handheld Colorimeter) is a simple, accurate and cost effective way to measure pH in saltwater.  ...

Precision device with fine adjustment for standard CO2 cylinders, thread in keeping with German standard DIN 477 (US version with...

Pinpoint ORP Redox 400 Calibration Fluid - 3 total packets