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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25
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Description
Sera Marin 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.
For the uncomplicated monitoring of marine water densityThe 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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Amazing for kids!
Format: Paperback
I've bought several of these for my kids and my niece and they have loved all of them! Tons of activities in each book and my kids take them on our trips for something to do in the plane or car rides. I definitely recommend any of these! We have Sharks, Soccer, Gymnastics, and Monster Trucks.
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Reviewed in the United States on October 1, 2025
★★★★★ 5
JUST SHARKLY FUN!!
Format: Paperback
THIS IS A SENSATIONAL SHARK ACTIVITY BOOK! AWESOME PRICE AND LOTS OF STUFF TO KEEP THE KIDS BUSY AND COLORING FOR HOURS!! Perfect for kids of ALL ages! It is fun to color and to do the other activities! Good price, as well!!
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Reviewed in the United States on June 10, 2024
★★★★★ 4
It's sharks my kid loves it
Format: Paperback
He likes it
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Reviewed in the United States on December 5, 2024
★★★★★ 5
Fun shark activity book
Format: Paperback
I bought 2 for a friends kids. The activity’s are age appropriate and there are lots of different types. The kids love them and there are enough activities to keep them entertained for a wile. Definitely recommend.
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Reviewed in the United States on August 15, 2025
★★★★★ 5
Lots of activities and pictures of sharks
Format: Paperback
My 4 year old grandson loved it.
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Reviewed in the United States on December 28, 2023
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