This pH drop checkers contains a small amount of chemical and you place in it a few drops of your tank water and then submerse it and attach it to the inside of your tank. The liquid turns either blue for too little CO2, green for the ideal amount and red too much. One end of the bubble is open to the water and so CO2 in the water disperses into the chemical.

The RHS series of portable refractometers is designed to measure the salinity of sea water and saline solutions of similar concentration. One scale checks the NaCl levels with the range of 0-100 ppt (with 1 ppt scale divisions) and the other scale gauges Specific Gravity with a range of 1.000 to 1.070 ( /- 0.001 accuracy). Both enable the direct determination of salinity in water that contains dissolved salt and little or no other dissolved solids.

This hydrometer has an easy to read 2-color scale with a safe zone, improved no wet hands design, extra wide stabilizer base, accurate to +/- 0.001, full range scale from: 1.000 to 1.032 in .002 increments except in the safe zone, there it is in .0001 increments (specific gravity), 0 to 40 PPT in increments of 2 (salinity).

The Salifert Calcium Test Kit is capable in resolving the calcium content in 10 mg/L steps. The color change is sharp and facilitates the detection of small but highly significant fluctuations in the calcium concentration. Salifert is the only one in offering a true accuracy and precision as claimed.

Salifert Phosphate Test Kit offers highly reliable and informative phosphate measurement crucial for timely corrections. Even in low concentrations, phosphate can compromise water quality as well as the health of aquarium inhabitants. The Salifert Phosphate Test Kit detects phosphate-phosphor in two different ranges. The mid-range test is ideal for routine testing and low range is designed for scrupulous monitoring of reef aquariums. 60 tests. For use in marine, freshwater aquariums, and water garden ponds.