HM Digital

TDS-3 Handheld TDS Meter

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The TDS-3 Handheld TDS Meter from HM Digital is a useful tool to spot check the TDS of your home water supply or RO/DI unit output. This unit features a digital display, built in thermometer, and comes with a carrying case. As with all HM-Digital products, the TDS-3 comes factory calibrated.

More Information
UPC 891144000083
TDS Meter Type Handheld
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Product Questions

Hi, how would I convert the tds reading in ppm to an EC reading - the conversionn depends on the type of tds meter - is this a hanna / trunchon / eutech meter?
Question by: john on May 11, 2022, 5:52 PM
The TDS-3 meter (https://www.bulkreefsupply.com/tds-3-handheld-tds-meter-hm-digital.html) is manufactured by HM Digital and not related to Hanna Instruments or other manufacturers. We do not have any conversion information for this unit so we suggest reaching out to HM Digital directly at 800-383-2777 or info@hmdigital.com.
Answer by: Scott F. (BRS Staff) on May 17, 2022, 5:17 PM
Hi, where is this product made?
Question by: Sergio Lopez on Dec 9, 2021, 11:34 PM
Thank you for your question. The HM Digital TDS-3 is manufactured in China.
Answer by: William Glenn (BRS Staff) on Dec 15, 2021, 1:53 PM
Is this unit Temperature Compensated or do we have to calculate the error ourselves… how would we do that?
Question by: John on Nov 2, 2017, 12:18 PM
Hey there,

This TDS meter has built in temp compensation. :-)
Answer by: Randy on Nov 26, 2017, 9:25 AM
Does this pen require the electrode to be stored in a solution?
Question by: Fenifur on May 23, 2016, 12:10 PM
Great question! The electrode does not need to be stored in a solution.
Answer by: Carter on May 25, 2016, 3:10 PM
Can it read .000? or .001? or at what level can it read?
Question by: Albert on Mar 21, 2016, 11:43 AM
Great question!
This meter will read 000 up to 999. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 22, 2016, 10:39 AM
Hi , I own one of the meters, after bateries died, misplaced them and need to know the type it takes, please. Thanks for your time.
Question by: Matthew Mcalum on Mar 17, 2016, 3:55 PM
Great question!
These will use the LR44G battery. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 18, 2016, 11:09 AM
does this need calibration fluid?
Question by: trent on Apr 26, 2014, 3:50 PM
Hi Trent,
No, they come pre-calibrated from the factory. Given the sensitivity of the instrument and the process involved its really recommended to not mess with the calibration or your really likely to make it less accurate.
Answer by: Bulk Reef Supply on Apr 26, 2014, 3:50 PM