boxtech Aquarium Marine Test, Sea Saltwater Hydrometer, Reef Ocean Hydrometer Salinity Meter for Pool Aquarium Water Salinity Specific Gravity Test
Original price was: $15.99.$9.99Current price is: $9.99.
Price: $15.99 - $9.99
(as of Nov 04, 2025 11:42:00 UTC – Details)
Product description
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Customer Reviews
3.2 out of 5 stars 89
4.3 out of 5 stars 760
4.4 out of 5 stars 252
3.7 out of 5 stars 1,352
3.7 out of 5 stars 4,304
Price
$28.99$28.99 $42.99$42.99 $18.99$18.99 $45.99$45.99 $14.52$14.52
for aquarium
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Is Discontinued By Manufacturer : No
Product Dimensions : 5.12 x 9.06 x 0.98 inches; 1.76 ounces
Item model number : YDJ
Date First Available : July 26, 2018
Manufacturer : boxtech
ASIN : B07FXV8KZ3
Best Sellers Rank: #50,572 in Pet Supplies (See Top 100 in Pet Supplies) #7 in Aquarium Hydrometers
Customer Reviews: 4.0 4.0 out of 5 stars 280 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
🐠 Safe Material & Unique Design: Made of durable Acrylic, this Fish Tank Test Kit salinity Hydrometer is designed with an automatic level function
🐠 Quickly, easily, and accurately measurement: With this hydrometer saltwater aquarium test kit, you can test your marine aquarium’s salt level and specific gravity, and It is optimum to be put into below 6″ deep water to avoid the error caused by the oil film on the water
🐠 Higher Accuracy & safe zone indicated: Readings are temperature-corrected & accurate to +/- 0. 001. specific gravity units ranges from 1. 000 – 1. 030 with a safe zone of 1.020-1.023. The outside range of scale indicates salinity ppt, ranges from 0-40, safe zone is 27-31
🐠Easy to Read & Clean: The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result. After use, soak this saltwater meter in mild acid(vinegar) for 30 minutes, rinse with tap water and air dry. Do not disassemble
🐠 Wide Usage:Fit for brackish and reef salt marine aquariums. Perfect for testing both salinity and specific gravity of your brackish and marine tank.Includes salinity and specific gravity scales.Suitable for fresh water and sea water
13 reviews for boxtech Aquarium Marine Test, Sea Saltwater Hydrometer, Reef Ocean Hydrometer Salinity Meter for Pool Aquarium Water Salinity Specific Gravity Test
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Original price was: $15.99.$9.99Current price is: $9.99.
Timothy Sucese –
Wo
Works wonders
G. Peralez –
Not accurate
It kinda work, but its inaccurate.
Lori L Koble –
Make sure you read this.
If you are new to these, pay attention. Bubble will form on the float and they need to be shaken off (very easy). Do NOT install this in your tank or it will grow algae on it.How to use properly:1. Fill with water, knock against tank to take off bubbles.2. Repeat step 1 like 5 times3. Fill with water and read.This is calibrated at 77 degrees F or 25 degrees C. If you have cold water fish (under 25C) use google.com to find the conversion tables. it is not much of a difference, but if you are keeping very cold water expensive corals and fish… ‘mightcould want to check it out.
meagan724 –
Extremely Inaccurate
I have brackish shirmp, so I bought this to help adjust the salinity. Thankfully I was doing very small amounts of salt so as not to stress them. However the readings on this never seemed to changed and I didn’t want to risk the shirmp.So I got a bowl of water and measured it at 1.004, dumped a ton of salt and waited about 30 minutes and tested it again. Showed at a 1.012, poured it back and tried the same water and it showed 1.019, and then 1.014 and a 1.016. Safe to say this meter will be going straight to the trash and I’ll be looking for a new one.
Lisa Baynes –
Very accurate
I own a refractometer which is extremely accurate but I still like the convenience of just dipping a box type specific gravity meter and getting instant results.Having owned several of these from all the different manufacturers, Coralife, Instant Ocean, etc. I always found them unreliable at best. This Boxtech one has been very accurate so far and almost matches what my Refactometer says. It reminds me of the very first hydrometer I had 30+ years ago in its design and accuracy.
Marisa –
Functional sensing is appropriate and accurate
Functional sensing is appropriate, accurate and thoughtful service. I’ll buy it next time. Very good. The handwriting is clear. This one is very convenient to use, with high accuracy. There are no problems in using it. It’s very convenient. It’s very small. It’s very delicate. It’s worth buying
Hunter M –
Not even close to accurate
So I bought this as a back up, I double check all my water prior to doing a water change. I have an automatic readout and a couple other plastic hydrometers like this. This thing wouldn’t even register RO/DI water. Telling me the salinity was off the charts. Yes I knocked all the bubbles off with the point and tapped the sides and sat it on a flat surface. Maybe the float stick is a little to much, I’m not sure but this thing is way off.
Randall H. –
Base is too narrow.
The narrow base makes it easy to tip over.
C.S. –
Skala gut ablesbar. Schnelle Lieferung
Pa Ben –
ottimo
Blackbird –
Nicht zugebrauchen
eric dupuis –
Does the job. Probably not the best option
Client d’Amazon –
Peu fiable en mesure. Je ne recommande pas. J ai acheté un autre dispositif pour mesurer la salinité bien plus fiable pour mon terrarium