"This is a terrific addition and you'll want a digital refractometer if you spend any time at all with saltwater aquariums

Fill bottle with water

Sediment and particulates

MC720 PRO pH Controller

Both results are expressed as g/L tartaric acid

HI96822 Digital Seawater Refractometer | Salinity & Specific Gravity | Hanna seychelle bundle "This is a terrific additionThe HI96822 is a rugged, portable digital refractometer designed for the measurement of salinity of natural or artificial seawater. The HI96822 displays results in three popular measurement units: Practical Salinity Units (PSU), salinity in parts per thousands (ppt) and specific gravity (S. G. (20 20)). The instrument's high accuracy and simple operation gives reliable results each and every time. All readings are automatically compensated for