1. See Detail

TDS Tester & Monitor, Check Total Dissolved Solids Aquarium + More (28-6)

In stock


Reverse Osmosis Aquarium Filters, Window cleaners, Ideally any system that you need to measure your Total Dissolved Solids (TDS)

This TDS Meter is fully transferable to other systems aswell. Simply unplug the quick connect tee from the water line and move it to another system

You would be very surprised how high your TDS can be especially in areas where town supplys are often subsidized by old council bore water setups.


Program Monitoring TDS Value

Keep pressing "DISPLAY" button, then press "RESET" button. You are now in programmable mode and you will see the number flashing on your screen. You can choose between -5, 10-15, etc etc..

Automatic Testing Mode, testing TDS every hour.

If the TDS value tested is lower than setting value, it displays the value testing on screen. If TDS value tested is higher than setting value, the measure TDS value is blinked. the monitor enters into alert status and stop testing when the measure value is over the setting value for continue three times.

Check monitoring TDS value

Pressing "Reset" button, the RT-790 will blink the monitoring TDS value 3 times, then come back to "Automatic Testing Mode"

Turn off Automatic Testing Mode

Keep pressing "Reset" for 4 seconds will turn off the "Automatic Testing Mode", and return to "Manual Testing Mode".

Manual Testing Mode

Pressing "Display" Button to test. If TDS value tested is lower than setting value, the value tested shows on screen, and then returns to automatic testing mode. If TDS value tested is higher than setting value. The measured TDS is blinked


RT-790 generates 5 times of "beep-beep" sound every 15minutes and generates 15 times of "beep-beep" sound every hour.


In alert status, pressing the "Display" button will release the alert status and enter into "Automatic Testing Mode" again.

Package Includes:

2 AA Standard Batteries
2 Sticky / Velcro Pads
Detailed Instruction Guide 
1/4" Tee Quick Connect Fitting


Type: Inline TDS Meter 
Model Name: RT-790
Range: 0-999ppm
Program Range: 5-200ppm
Accuracy: +/- 2%
Fittings: 1/4" Standard
Power: 9V Alkaline Battery
Weight: 80g
Cable Length: 45cm


Length: 70mm
Height: 55mm
Width: 33mm


You can also calibrate the TDS meter with our TDS fluid which is available from Store Categories > Water Test Meters & Equip.

Also it is a good idea to keep the steel sensors clean to ensure the most accurate reading. This can be done every few months.



Due to the nature of the products we sell, a strict return policy is in place. We work with food grade certified materials that must be un-opened and un-used as to be able to be re-sold.

You will receive a credit of equal amount, less the postage cost to send it to you. 

  • Wrongly purchased items may be returned for a merchandise credit, this applies for but not limited to: Wrong size, wrong system etc.
  • 30 Day return Policy: We will accept returns up to 30 days after the initial purchase, all orders should be checked immediately for damage/fault upon arrival to aid us with the return process.
  • Return shipping is to be paid by the buyer to the address provided
  • Should the item appear faulty or doesn’t work how described, the unit/item must be returned for testing (if requested), the return postage paid by the buyer. If the unit/item is deemed to be faulty, compensation will be provided for the postage cost. If the unit/item is deemed to be in working order and as described, the buyer will need to pay for return postage. 

If you have any questions about our return policy, please contact us before purchase. This will also help to ensure you purchase the correct product that suits your requirements.

More Information
Product Type Water Filtration