Shop for Aquarium Hydrometers

Floating glass hydrometer for measuring aquarium specific gravity Extremely simple-to-use hydrometer for fast and effortless testing Monitor and maintain proper specific gravity in saltwater aquariums Extreme ease of use makes the standard floating hydrometer a classic favorite. Measuring aquarium specific gravity is as simple as floating the Sera Marin Hydrometer in your marine aquarium. Features measurement range of 1.000-1.040 with graduation increments of 0.01. The Sera Marin Hydrometer is calibrated at 77 degrees Fahrenheit (25 degrees Celsius) and measures 5/8" diameter x 6-1/2".Please click on "More Information" for tips on testing.

Tests aquarium salt level and specific gravity. Easy-read 2-color scale with Safe Zone Improved no wet-hands design Extra wide stabilizer base Accurate to +/-0.001 Full range scale

Easy-to-use swing-arm style hydrometer for brackish and marine systemsPrecise full range salinity and specific gravity readingsLarge easy-to-read pointer and wide stabilizer baseInstant Ocean's durable, clear acrylic, swing-arm hydrometer is easy to use and easy to read. Full-range results in both salinity and specific gravity (0 to 40 ppt salinity and 1.000 to 1.030 specific gravity) with color-blocked "safe zone" to make routine testing quick and accurate. Features large swing-arm pointer, extra-wide stable base and "easy-dip" design to keep your hands dry while obtaining water sample. Temperature-corrected for use between 68 and 85F with specific gravity readings accurate to ? 0.001.Please click on "More Information" for instructions, care and ideal saltwater aquarium parameters.

Hard Plastic

Designed so you can take samples at a depth of six inches, without having to submerge your hands in water. Accurate to +/- 0.001 specific gravity.

Easy-read swing-arm hydrometer measures specific gravity and salinityUnique design takes true water samples for accurate readingTemperature-corrected and accurate to ?0.001 specific gravity unitsPrecision hydrometer tests both salinity and specific gravity accurately and without getting your hands wet. Distinct vertical design takes water samples six inches below the surface where samples are more accurate than water at the surface. Gently diverts water to reduce excess bubbles and convenient self-leveling hanging device further eliminates inaccurate results. Wide range hydrometer reads temperature-corrected readings accurate to ?0.001 specific gravity units. Certified calibration for precise and reliable results. Durable plastic construction for years of use. Measures 16 - 43 PPT salinity and 1.012 - 1.032 specific gravity. 6-1/4" x 11" high.Please click on "More Information" for directions and ideal saltwater aquarium parameters.

Coralife' Deep Six Hydrometer takes a true water sample at a depth of six inches. Easy to read and extremely accurate, this specific gravity meter is designed to give temperature-corrected readings in warm water aquariums. Includes a self-leveling, hanging device and allows your hands to stay dry, avoiding contamination of your aquarium' water.

Compact swing-arm hydrometer ideal for all saltwater aquariumsUse for periodic or continuous salinity and specific gravity readingsCertified calibration for accurate measurement of aquarium salt levelsKnow aquarium salt levels at a glance without obstructing beautiful views. Compact Mini Hydrometer is the smart, space-saving solution that allows discreet and accurate measurement of aquarium salinity and specific gravity. This submersible swing-arm hydrometer measures only 2-3/8" x 1-7/8" and 5/8" thick, roughly the size of a matchbook. Use as an in-tank hydrometer for continuous readings or simply remove for periodic routine readings. Features calibrated hydrometer arm and built-in leveling needle for accurate readings. Ideal for placement in all saltwater aquariums and sump filtration systems.Please click on "More Information" for directions for use.

Precision calibrated hydrometer shaped like an ammonite Yellow needle highlights scale for easy-to-read measurement Accurately test salinity or specific gravity of saltwater aquariums Add style to routine testing with the "designer" Ammonite Hydrometer. Distinct ammonite shape enhances aesthetic appeal without sacrificing accuracy or functionality. Patented "fill-from-bottom" design ensures sample aquarium water fills the ammonite chamber with little or no air bubbles that can distort needle reading. Each hydrometer is calibrated with a weighted disc that is given a unique serial number of certification. Bright yellow needle contrasts and highlights scale for easy-to-read measurements. Measures salinity in ppt (part per thousand) or specific gravity. Ammonite Hydrometer measures 5-5/8" x 5/8" x 4-3/4" high.Specifications Calibrated at 68 degrees Fahrenheit Range: 16-43 ppt Accuracy: ?0.5 ppt Range: 1.012-1.032 specific gravityPlease click on "More Information" for directions for use.

Aquarium Systems Saltwater Hydrometer is a durable, clear acrylic, swing-arm hydrometer that is easy to use and easy to read. Full-range results in both salinity and specific gravity (0 to 40 ppt salinity and 1.000 to 1.030 specific gravity) with color-blocked "afe zone"to make routine testing quick and accurate. Features large swing-arm pointer, extra-wide stable base and "asy-dip"design to keep your hands dry while obtaining water sample.