Salt Refractometer with ATC - 0 to 100 PPT Nutrients Replacement Pre-filter for the Airbox

Replacement Pre-filter for the Airbox 4+: This item is a replacement pre-filter designed specifically for use with the Airbox 4+

Enhanced Terpene Production: Naturally increases the concentration of terpenes in plants by providing a precise balance of phosphorus and potassium

it provides cleaner and healthier water for drinking

1 to 80% 0

and ventilate home rooms like attics

Salt Refractometer with ATC - 0 to 100 PPT Nutrients Replacement Pre-filter for the AirboxSper Scientific portable refractometers work in ambient light with no battery or other power source necessary. Features Automatic Temperature Compensation (ATC), which makes manual temperature corrections unnecessary. Double scale in parts per thousand and specific gravity. Measures salt content in sea water, breeding ponds, or pickling brines and other applications. While the scale is calibrated for sodium chloride, it can also be used for calcium