JW Pet 21600 First Impressions
Working wonderfully!
These digital thermometers are great and there is no guesswork involved. So the extra units will always come in handy. Since it is a mercury thermometer, it is very accurate. I did have a problem with one in my first pack of 6. I have mine on my 60 gallon cube marine tank. Only thing I don't love is how long the cord is. When and if we run out of this batch, I'll instantly order another batch.
- Editor's Impressions Of The JW Pet 21600
- Thermometer Accuracy [star rating='4.2']
- Build Quality [star rating='4.4']
- Value For Money [star rating='4.3']
- Feature Set [star rating='4.2']
JW Pet 21600 Final Thoughts
I like this.
I used these on a number of my aquariums that have discus fish in them. It works equally well on all of them. Very impressed, I have now had them in used for a month so far. So far, they're all doing their job in my four tanks and I am quite content. So this is the extreme end of the high temperature range. I have to admit I had two reasons for buying six. The extra batteries where very much appreciated and came in handy.
Overall Score
4.5
(1488 Points)

- JW Pet 21600 Features & Specs
- In-tank thermometer is secured with magnet outside the tank
- No suction cups needed
- Green safe zone indicates optimal temperature range
- Large easy to read numbers
- Manufacture: JW Pet Company
- Product Dimensions: 4 x 7 x 0.5 inches; 1.12 Ounces
Check Out These Other Top Rated Aquarium Thermometers - View All
- Quality [star rating='3.5']
- Value [star rating='3.7']
- Features [star rating='4.8']
- Check Price
Zacro LCD Digital Aquarium Thermometer Fish Tank Water Terra...
Aquarium Thermometers
User Ratings: 74 3
- Quality [star rating='4.7']
- Value [star rating='3.6']
- Features [star rating='4']
- Check Price
Zacro Pack of 2 LCD Digital Aquarium Thermometer Fish Tank W...
Aquarium Thermometers
User Ratings: 73 2
- Quality [star rating='5']
- Value [star rating='3.9']
- Features [star rating='4.2']
- Check Price