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 Rated 4.8 Excellent - Trusted By 17,000+

TankSentry ™

$259.99
$259.99
SAVE Liquid error (snippets/price line 116): Computation results in '-Infinity'% Sold out
 

check_circle Nothing Fouls Since It Never Touches Water

check_circle Get Alerts Before Tanks Run Low Or Full

check_circle Check Every Tank Right From Your Phone

check_circle No Drilling Required For Easy Install

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Mini Digital Hygrometer / Thermometer
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Mini Digital Hygrometer / Thermometer
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I used to climb a ladder every week just to guess how full the tank was, rain or shine. Now TankSentry sends alerts straight to my phone, so I can check levels from the porch during a storm instead. It completely changed how I manage the property.

Verified Buyer - Marcus T.

  • Mount the sensor to your tank lid with the included gasket. No drilling, no cutting into the tank.
  • Connect to your home WiFi through the free app and enter your tank's height so readings show as an exact percentage.
  • Check real-time levels, get low and full alerts, and review history from your phone, wherever you are.

  • 1x TankSentry Ultrasonic Water Level Sensor
  • Mounting Gasket & Waterproof Seal Kit
  • Quick-Start Installation Guide
  • Free Lifetime App Access (iOS & Android)

We offer free shipping for all orders. Once your item/s is dispatched,
the estimated delivery time is:

- USA: 2-9 business days
- UK: 5-13 business days
- Australia: 5-13 business days
- Canada: 2-12 business days
- Europe: 5-13 business days

You have 90 days to return your product for a full refund (return shipping is covered by the customer; defective items ship a free replacement).

✓ Official Authorized Retailer

This product is not available on Amazon or eBay. You are purchasing directly from the only authorized seller — which means full warranty, verified authenticity, and dedicated customer support. Beware of counterfeit listings on third-party marketplaces.

TankSentry

TankSentry

 4.8/5
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  • Over 17,000 recommend TankSentry

Water Levels You Can Actually Trust

sensors

Sensing That Never Touches Water

Sound-wave sensing reads your tank's exact level without ever dipping into the water, so there's no probe to corrode, clog, or coat in sludge.

notifications_active

Real-Time Low And Full Alerts

Push alerts tell you the moment a tank runs low or hits full, before it ruins a trip. Check it from the couch, even in a storm.

TankSentry
dashboard

Multi-Tank Dashboard

Track fresh, gray, and black tanks side by side, whether on a farm, rental, or boat. Label each one and check history anytime.

build

No Drilling Required To Install

Mount the sensor to your tank lid in minutes with the included gasket, no drilling or modification needed. It stays dry above the waterline.

What our 17,000+ Customers say

Based On Real and Honest Experiences

Marcus T.

I used to climb a ladder every week just to guess how full the tank was, rain or shine. Now TankSentry sends alerts straight to my phone, so I can check levels from the porch during a storm instead. It completely changed how I manage the property.

Marcus T.Verified Buyer
Elena R.

We run three separate cisterns on our farm, and juggling them used to be a nightmare. TankSentry put every tank on one dashboard, and I get notified the second any level runs low. No more walking the property every morning just to guess.

Elena R.Verified Buyer
David K.

Honestly, I was burned by my RV's factory sensors before, so I didn't expect much from TankSentry either. First trip out boondocking, it read my fresh and gray tanks accurately the whole week, and setup only took about ten minutes.

David K.Verified Buyer

Frequently Asked Questions

verified +347 experts reviewed it as the best choice in 2026
Q1 How does the ultrasonic sensor actually work?
It sends sound pulses down to the water's surface and calculates depth from how long they take to bounce back. Since nothing ever dips into the tank, there's no probe to coat in sludge or corrode over time.
Q2 Will it work on black or gray water tanks?
Yes. Since it mounts above the tank and never touches the liquid, there's no probe inside to get coated in waste buildup, the main reason black tank readings turn inaccurate over time.
Q3 Will it work on a buried tank or an oddly shaped cistern?
Yes. As long as the sensor sits on the tank lid with a clear path down to the water's surface, it reads accurately regardless of whether the tank is buried, square, round, or an unusual shape.
Q4 How long will this last compared to cheap sensors that fail?
There's no internal probe to corrode, no float to jam, and no wiring inside the tank to short out, the top reasons cheap monitors quit within a year. With nothing touching the water, there's simply less to fail.
Q5 How many tanks can I track at once?
As many as you need. Add a sensor for each tank, fresh, gray, black, or a separate cistern, and label them in the app so checking multiple tanks feels as simple as checking one.
Q6 Is there a monthly fee for the app or alerts?
No. The app and every alert are included for free, for the life of the device. You get full access on iOS and Android with nothing extra to pay month to month.
Q7 Can this automatically control a pump?
Yes. Pair it with a compatible relay and set your own low and high thresholds so a pump can refill a cistern or livestock tank automatically, no more checking levels by hand every morning.
Q8 Does it require drilling holes in my tank or RV?
No. The sensor mounts on top of your tank lid with the included gasket, no drilling, no cutting, and no modifying the tank itself. Most owners have it mounted and reading levels in under ten minutes.
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