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Description
hygger 500W Aquarium Heater for Fresh-Water Salt-Water, with External Digital Display Thermostat Controller and Thermometer, Auto Quartz Submersible Heater for Fish Tank 60-120 GallonAbout This QUICKLY HEAT UP Voltage 110 120V 60HZ, power 500W, US three pin plug, heater rod length 10. 5 inch. Fast heating up aquarium heater, it takes about 3 minutes to heat 3. 5 gallon water up 3 AUTO ON AND OFF Reliable submersible aquarium heater. It will stop heating when the water temp reaches to the set temp, please note that the water temp may go up 1 more because of the waste heat. When the water temp is cool down to 1 less than the set
About This
- QUICKLY HEAT UP - Voltage 110-120V/60HZ, power 500W, US three-pin plug, heater rod length 10.5 inch. Fast heating up aquarium heater, it takes about 3 minutes to heat 3.5 gallon water up 3℉
- AUTO ON AND OFF - Reliable submersible aquarium heater. It will stop heating when the water temp reaches to the set temp, please note that the water temp may go up 1℉ more because of the waste heat. When the water temp is cool down to 1℉ less than the set temp, the tank heater will restart heating
- FULLY SUBMERGED - The heater tube and the separate sensitive thermometer must be completely submerged under water all the time. Please unplug it and wait it to cool down before you removing the heater or doing water change
- LED DISPLAY CONTROLLER - Only show Fahrenheit degrees. To set the temp, just press the button over and over until the screen displaying the temp you desired, then stop and wait the digit flashing for 3 times, the setting is done and the led shows the current water temp again
- FOR LONG TIME USE - Very durable and explosion-proof aquarium heater, can be used for saltwater and freshwater aquariums, service life can be 3 years or more. With low profile black plastic guard, easy to hide in the tank. Contact the seller at first time if have any product problems.
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4.9 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 4
Overall it was an OK book. I am already ...
Format: Paperback
Overall it was an OK book. I am already "competent" with DNS, specifically the BIND9 implementation but I got the book as reference material since the official documentation is a little sparse. The fifth edition (not sure about the others) even covers, albeit a little too briefly, how to deal with reverse lookup zones with subnet masks that do not fall on octet boundaries.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 31, 2015
★★★★★ 5
Domain Names...Serves us!
Format: Paperback
This is the most complete and must-have DNS book i've ever seen before. Nor only prepares you to understand every basic and some advanced issues about DNS, it also shows a lot of "tricks" with the most powerfull and well know - famous DNS implementation!: BIND.
If you are a beginner in the DNS world, this is a good step towards become an expert, if you're already an expert this guide will surely show you a lot of useful information in your daily DNS administration problems.
Definitely, this was one of my best investments on my way to become a site administrator.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 11, 2011
★★★★★ 5
Thicker than I anticiapted
Format: Paperback
The encyclopedia of DNS books, meaning thicker than a phone book.
I like the fact that this book is thick but so easy to read and follow along with. If you know nothing about DNS, this book makes it easy to learn about DNS. It starts with the history of DNS and then explains the hierarchy of the DNS tree. A must read if you want to improve your understanding of the internet and what happens under the hood for name resolution.
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Reviewed in the United States on February 7, 2014
★★★★★ 5
Best practical book on DNS and how it works
Format: Kindle
I was interested in finding out more about how DNS is deployed and operated in practice. The first few chapters in this book deliver very well in this regard. My motivation was to find out more about how a certain type of Internet attack -- the "open DNS resolver attack" -- works. Even though this book was written well before this attack became popular and well known -- and therefore the attack is not mentioned, let alone analyzed -- the book was still quite helpful to me.
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Reviewed in the United States on June 1, 2014
★★★★★ 5
DNS reference
Format: Paperback
The book arrived in perfect condition. This a reference of dns related knowledge.
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Reviewed in the United States on July 11, 2024
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