The HANNA HI 711 Checker HC bridges the gap between simple chemical test kits and professional instrumentation. Chemical test kits are not very accurate and only give 5 to 10 points resolution while professional instrumentation...
The Refractometer is a must have for all aquarium hobbyists. The proper salinity is crucial for the survival and health of your fish and corals . This high quality refractometer is extremely accurate and easy to use and calibr...
High Accuracy Seawater Refractometer!
Red Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25°C/77°F.
Most refractometers used within the aquariu...
Precision of +/- .01
10` coax cable
Sealed Ag/AgCI reference.
Standard BNC connector
The Captive Purity Refractometer is an incredibly accurate and easy to use device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Rea...
LSM Lunar LED String – 3 LEDs
*Use this string of LED in combination with your Apex system and Lunar Simulation Module (LSM)
When you purchase the Apex Controller and Lunar Simulation Module you need to outfit it with a ...
Ultra-High Accuracy & Precision Laboratory Grade Mail-In Water Testing Service.
Marine Basic Lab Test series for saltwater aquariums tests 13 important aquarium water parameters.
Kit includes two empty sample bottles...
The PH-80 is an economically priced, reliable pH meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.
Direct probe connection
Automatic Temperature Compensation
The Primo series of testers provide a fast and dependable way to measure the total dissolved solids or conductivity in your water samples. It...
Spare electrode for HI 98121, HI 98127, HI 98128, HI 98129 and HI 98130
Expansion Socket The Digital Aquatics Expansion Socket allows you to control high current devices without affecting your ReefKeeper power budget
DC Pump Control... now available with all ReefKeeper systems!
The new DCI module allows you to expand your existing ReefKeeper system even further - offering full control over 24V direct current (DC) pumps that use round 3-pi...
Spare pH electrode, with Teflon ® junction, 2 m (6.6') cable, for general purpose, water treatment and agriculture.
Hanna Instruments Replacement Electrode for DiST 5 Waterproof Low Range EC/TDS/Temperature Tester