SKU: 302160087

Sera Magnesium-Test (Mg)-Reagent 3 Refill Pack-3x15ml [Volume - 45ml]

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Description

Sera Magnesium-Test (Mg)-Reagent 3 Refill Pack-3x15ml [Volume - 45ml]This product is designed to measure the concentration of magnesium in a marine aquarium and includes a spare cartridge for reagent 3. Warning! Reagent 1 contains sodium hydroxide, which can cause serious burns. Keep this reagent securely stored and out of reach of children. Always wear protective gloves when handling. If the substance comes into contact with your eyes, rinse immediately with water and seek medical attention. If you experience nausea,

This product is designed to measure the concentration of magnesium in a marine aquarium and includes a spare cartridge for reagent 3.

Warning! Reagent 1 contains sodium hydroxide, which can cause serious burns. Keep this reagent securely stored and out of reach of children. Always wear protective gloves when handling. If the substance comes into contact with your eyes, rinse immediately with water and seek medical attention. If you experience nausea, consult a doctor and bring this manual with you.

A proper magnesium concentration is essential for the health of marine invertebrates and algae. A prime example is the red calcareous algae, which require substantial amounts of magnesium to form their skeletons. Natural seawater typically has around 1300 mg/l of magnesium. To create optimal conditions in your marine aquarium, it's crucial to maintain this concentration. The Sera magnesium test allows you to quickly and easily assess the magnesium level in your aquarium. You can also effectively boost magnesium levels using Sera magnesium plus.

Additionally, magnesium levels can be raised with Sera marin COMPONENT 6 magnesium. The amount of reagent needed will depend on the calcium levels in the water you are testing.

Store in a cool, dark place!

Instructions for Use:

In a marine water aquarium, maintaining an optimal magnesium level is vital for the thriving of invertebrates and decorative algae. Red calcareous algae are a great example, as they require high magnesium levels for their skeletal structure. Natural marine water contains around 1,300 mg/l, which should also be replicated in your aquarium for ideal conditions. The Sera magnesium-Test enables you to monitor your aquarium’s magnesium levels swiftly and efficiently. If you have prior testing experience with the Sera calcium-Test, this will be even easier for you. You can easily enhance the magnesium level in your marine water aquarium by using Sera marin COMPONENT 6 magnesium.

Directions for use: Shake the reagent bottles well before use! Avoid letting the tested water come into contact with aquarium or pond water!

  1. Rinse the measurement vial several times with the water you wish to test, then empty it. Dry the outside of the vial.
  2. Rinse the syringe multiple times with the water to be tested, then use it to fill the vial with 2 ml of this water.
  3. Add 6 drops of reagent 1 and shake the vial until the liquid is evenly mixed. Any cloudiness that appears will not affect the test.
  4. Add one level measuring spoon (provided in the kit) of reagent 2 to the vial and gently swirl (do not shake) until the powder has dissolved.
  5. Gradually add reagent 3 drop by drop while counting them. After every 5 drops, release pressure on the bottle to allow air to enter. Shake the vial after each drop until the color shifts from pink to blue (not violet) and remains stable for at least 30 seconds while you gently whirl the vial occasionally. Note the number of drops used.
  6. Empty and thoroughly rinse the measurement vial with tap water, then rinse it several times with the water to be tested and empty it again. Dry the outside of the vial.
  7. Use the syringe to take up 2 ml of the water to be tested and fill the vial.
  8. Add 6 drops of reagent 4 and shake the vial until the liquid is evenly mixed. Any cloudiness that appears will not affect the test.
  9. Add one level measuring spoon (included in the kit) of reagent 5 to the vial and gently swirl (do not shake) until the powder has dissolved.
  10. Add reagent 3 drop by drop while counting the drops, releasing pressure on the bottle after every 5 drops to allow air to be drawn in. Shake the vial after each drop until the color changes from red to green and remains stable for at least 30 seconds while whirling the vial occasionally. Note – you will require significantly more drops for this measurement compared to the first measurement!
  11. To find the magnesium level, subtract the number of drops used for the first measurement from the number of drops used for the second measurement. Multiply the remaining number of drops by 60 to calculate the magnesium level in mg/l. For example, if the first measurement used 4 drops and the second used 24 drops, subtracting gives you 20 drops. Multiplying 20 drops by 60 results in a magnesium level of 1,200 mg/l.
  12. Cleaning: Thoroughly clean the vial and syringe with tap water before and after each test. Close the reagent bottles immediately after use and do not switch caps. Store at room temperature and away from light. This product is intended for testing ornamental fish aquariums and pond water only.

Store in a cool, dark place!

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SKU: 302160087

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After using this mouse for a couple of weeks, it just confirmed again why I’m such a fan of Razer products. The ergonomics are excellent, and it feels surprisingly lightweight considering it uses a AA battery. The low latency with Hyperspeed technology is fantastic, and the sensor precision is seriously impressive. I spend hours playing Fortnite and the connection has been completely reliable the whole time. I’m also a designer, so I need accuracy for detailed work in Illustrator, and this mouse has performed perfectly for both gaming and professional use. Definitely one of the best wireless mice I’ve used.
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Reviewed in the United States on May 16, 2026
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Pedro Guimaraes
Whiting, US
★★★★★ 5
Excellent Wireless Mouse with Great Performance
Size: Standard
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Reviewed in the United States on January 12, 2026
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Saleem
Chelsea, US
★★★★★ 5
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Size: Standard
My previous mice include the Razer Deathadder V2, Razer Basilisk V2 X Hyperspeed, and the Logitech Pro X Superlight. This is easily the most comfortable mouse I've used, the contours feel perfect and the extra button the side is well placed and feels like a natural addition. I've personally not found the weight an issue, though it is much heavier that most other mice, even ones that use a AA battery. I do prefer the external battery as I disliked having to plug in my mouse every so often to charge it, something that became much more frequent as the internal battery lost capacity. The new switches feel excellent, a noticeable improvement from the V2. Performance is good in all areas with the exception of the scroll wheel, which feels like it eats inputs for breakfast lunch and dinner. Basically when scrolling fast the Basilisk V3 seems to skip inputs. My V2 had similar issues and eventually I had to replace it when the scroll wheel started acting haywire and scrolling on its own or backwards. Something to keep an eye on. Appearance is unremarkable. The new RGB scroll wheel is appreciated, but fairly simple in customization. I have it set to static color but you can have it be reactive to clicking, color cycle, breathing, or a few other options with Razer Synapse. One small quirk is that if you have auto sleep on, it takes a bit to actually turn back on when using it again. Whereas the Razer Deathadder V2 was near instant in my experience, the Basilisk V3 takes a few seconds to get going, which sounds like nothing but does make a difference when it happens so often. TL;DR - It's a really good mouse at this price point, good performance and great comfort. Only negative is the scroll wheel and the weight if that matters to you.
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Reviewed in the United States on October 24, 2024
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J. Boyd
Dallas, US
★★★★★ 4
Not as good as a 3S, but less expensive. Hopefully better quality switches than the 3S.
Size: Standard
I like this mouse, but it could be better. I purchased it to replace a Logitech MX-Master 3S, which is a great mouse except the microswitch for the left button stopped being reliable after less than three years. While that's a reasonable life for some users, perhaps, it seemed inadequate to me. My use case is general pc use for searching the web, writing emails, and managing finances. The Logitech wasn't used every day. The 3S has a higher palm hump, which the Basilisk lacks and I really prefer. The Basilisk is similar in overall size to the 3S, so for the most part it fits my hand sufficiently well. Hump size is the main downside to the Basilisk. That, plus the battery is not rechargeable. What, in 2026?! But I've adapted to it, and battery life so far has been very good. It has the combo BT + 2.4 gHz connectivity with a dongle. Both choices work very well and reliably. I like the center wheel size and action a lot. I like the slip pads on the bottom of the mouse. It has a very handy and perfectly responsive third thumb button that I don't currently use but gamers may find it useful. Only time will tell if Razer's microswitch quality is more durable, reliable, and longer lived than the crap switches Logitech put into the otherwise very good 3S. I have used the Basilisk about two months at the time of this review.
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Reviewed in the United States on May 1, 2026
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Cuba, US
★★★★★ 5
Responsive and versatile
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Great mouse. Love that I can change the cursor speed with the middle button. Very light. It does burn through battery pretty quick, but it only takes one AA battery and others I've used have needed 2. Is very responsive.
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Reviewed in the United States on April 29, 2026

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