SERA Marine Precision Hydrometer

Marsoni

M251S

$19.95

Get it in 3 business days with 1 day shipping. Friday, May 29

SERA Marine Precision HydrometerFor the uncomplicated monitoring of marine water density. The salinity (salt contents) can be deduced from the measured density. Since the salinity of marine water in an aquarium must be kept constant, the aquarium water should regularly be checked accordingly. The water to be tested is filled into a sufficiently tall water glass, and the scale of the immersed hydrometer is read off on according to its immersion depth. Suitable for use in saltwater

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This guide has been most helpful for all the folks I help prepare for the iTEP test! It gives insight into what each section of the test is looking for along with examples and great tips about actually TAKING the test. In the Writing and Speaking sections, it also gives sample scores and comments from the Master Grader which is very helpful too.

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Reviewed in the United States on August 9, 2019

Thomas J. Shandorf

West Palm Beach, US

★★★★★ 5

Comprehensive, clear and coherent!

Format: Paperback

The iTEP Practice Guide combines a no-nonsense approach to the specific iTEP tests and at the same time offers exercises that task the student with what they need to know. Exercises not only serve the purpose of scoring well, but the overall approach is communicative competence. We use the text in our group and one-to-one classes with very positive--and lasting--results.

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Reviewed in the United States on July 23, 2019

Verified Purchase

Sarah Sofía Ortiz Campos

Whiting, US

★★★★★ 1

No recomiendo

Format: Paperback

Muy malo, no vine completo, además se demoró mucho más de lo que decía al momento de comprarlo. Solo aplazaban la fecha de entrega sin consultar cómo afectaba al cliente. Yo tuve que presentar el examen sin el libro, porque no llegó en la fecha que decía al comprarlo y después se cambió 3 veces la fecha, casi cumpliendo el mes.

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Reviewed in the United States on December 30, 2025

Verified Purchase

Praying to the Car Gods

Cuba, US

★★★★★ 5

Great Gift for Young Coders

“Got this as a gift for a kid who’s starting to get curious about coding, and he really liked it. The visuals are clear, the instructions are easy to follow, and it breaks big programming ideas into fun, manageable steps. It’s not overwhelming, and it actually makes learning feel doable. Perfect for kids (or adults) who want to dip their toes into coding without getting lost in the jargon.” — Praying to the car gods

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Reviewed in the United States on October 15, 2025