








💧 Stay ahead of water worries with Haofy’s quick-test pen!
The Haofy Water Electrolyzer is a compact, battery-free pen that uses advanced electrolysis technology to deliver rapid, accurate water quality results. Designed for versatility, it’s ideal for testing drinking water, aquariums, pools, and spas, combining durability with user-friendly operation and backed by responsive customer support.


























































| ASIN | B09GW1CYY4 |
| Batteries required | No |
| Best Sellers Rank | #400,208 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #363 in Swimming Pool Water Test Kits |
| Customer Reviews | 4.1 4.1 out of 5 stars (98) |
| Item Weight | 6.4 ounces |
| Manufacturer | Haofy |
| Package Dimensions | 6.73 x 5.94 x 3.43 inches |
J**N
Perfecto y gran calidad.
S**M
Very educational
Good
R**R
Electric test
Works great was ar
P**A
Trash
Trash here in the US.. it didn’t come with power adapter which makes it into a nice paperweight.. if you live in the US don’t Buy this POS, if you do get the adapter bc they won’t tell you it doesn’t come with one.. real shady practice..
A**R
El producto llego bien y a tiempo.
A**E
Works quickly!
This device showed me the difference between my tap water and bottled water very quickly. Showed heavy metals in my tap water!
M**N
Water Testing
Dislike: It has a European plug in, thankfully, I found a travel adaptor which sort of work. Like: I've been able to test both a friends home and my home water, and our filtered water. I tested 8 different bottled waters. The results were shocking, however I did find 4 bottled waters that I can drink and not be concerned as to my life expectancy. I appreciate the ease of use and my 10 minute test results. Now I know I need a Whole House Water Filter System. Thanks, I recommend.
A**U
Buen material pero se daña muy rapido
G**I
Je n’ai pas pu m’en servir j’ai du recommander un autre testeur avec la bonne prise correspondante pour ce le Canada
A**S
i will be keeping this item and waiting to get back to EUROPE to use it as the stupid plug is not for Canada, but it was sold in Canada... can you imagine, and it is my fault for not seeing that??? who the hell sells something that literally does not work in Canada with the wrong plug ENTIRELY then asks how i am doing? clearly i am irritated and annoyed. NOT COOL
Trustpilot
2 weeks ago
3 days ago