 | JBL Precision Hydrometer for the exact determination of the density in marine water aquaria. The green zone on the scale of this aquarium hydrometer represents the ideal specific gravity (S.G.) for marine animals. The precision in the green zone is better than +/- 0.0005 at 25 °C.
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 | The Aqua Medic salimeter is a density meter (hydrometer) for easy measurement of the specific gravity of saltwater in aquaria. In reef systems, the specific gravity should be between 1.022 and 1.025. salimeter has a measuring range of 1.000 to 1.040, with graduations at every 0.001 and an accuracy of ± 0.0005 at 25 °C (77 °F).
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 | Aqua Medic DensiMeter is a highly precise hydrometer for measuring the density in marine water aquariums.
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 | Aqua Medic DensiTower is a hydrometer cylinder with overflow to determine the exact density by using a hydrometer.
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 | The Aqua Medic Refractometer is a precision optical instrument used to determine the salt concentration in saltwater aquaria. Its exact value can be determined in seconds and can be read either as absolute salt concentration (‰, ppt) or as specific density. When a beam of light enters the refractometer it is bent or "refracted" by the water in the test panel.
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 | Aqua Medic Testing solution 35 ppm for the calibration of the Aqua Medic Refractometer and Refractometers of other brands. The content (60 ml) is sufficient for several testings.
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 | Sera sea water Hydrometer for the exact determination of salt content in sea water. Marine fish and invertebrates need a density of 1.022 - 1.024.
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 | Tropic Marin Hydrometer is a high precision hydrometer for determining the specific gravity in aquariums. Many tank inhabitants are sensitive even to minor changes of the water conditions. For an exact, reliable measure of the specific gravity, Tropic Marin offers a high-precision instrument.
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 | Measuring and reading the specific gravity on the scale of the hydrometer will be easy with the Tropic Marin Measuring Cylinder. The high-quality plastic measuring cylinder is transparent, has a stable base and a spout. With a height of 36 cm (14 inches), it is ideally suited to determine the specific gravity using the Tropic Marin High Precision Hydrometer.
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 | Salifter Refracto Check is a testing solution with a density of 35 ppm for the calibration of refractometers. The content is sufficient for up to 100 testings.
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