what kind of batteries does this use?

303/357 Battery - SR44 - Silver oxide 190 mAhModel 357A

What are the recommended and maximum flow rates? PSI?

FROM HM DIGITAL: There are no recommended flow rates, but there is a maximum pressure rating, which is 232 PSI (16 bar) at room temperature (25C/77F).

Can this be dropped into a DWC 5 gallon bucket and left in there so to measure the ppm's anytime i turn it on (since wire is sitting in the water) ?

It should not be fully submerged, only the probe up to the threads should go into liquid. You could probably seal wire end with a conformant coating or silicone though, do NOT get any on probe end. Yes it can be used in a deep water or reservoir, it does need to have some type of consistent flow in the probe area... to give a consistent reading ! ...get it naysayers, please think before you post inaccurate advice. A basic bubbler agitating solution will work. Be sure to locate probe out of direct bubble area , the bubbles will skew results. I've also used these in unagitated tanks , they work...but will only read the general area , obviously. This will give a general, consistent, read for on the fly observations of nutrient solution, but you still need to compare with a true reading for accuracy. TLDR Dont fully trust this as your standard when used for hydro, DO use as a consistent observation guide,check occasionally against a REAL meter/test, and keep it out of bubbles or it'll get wonky readings.

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HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy,Blue & White

Product ID: 2742434

Details

Brand
HM Digital
Item Weight
1.6 ounces
Item dimensions L x W x H
1.9 x 0.8 x 3
Material
Plastic
Number of Items
1

🎯+/- 2% readout accuracy

💧0-9990 ppm TDS range

🔗Dual in-line sensor setup

€ 52.82

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Description

💧 Know your water, own your health — precision purity at a glance!

EFFORTLESS INTEGRATION - Includes quick-connect T-fittings and batteries for seamless installation under sinks or coolers.
ULTRA WIDE DETECTION RANGE - Covers TDS levels from 0 to 9990 ppm, ensuring accuracy across all water types.
MICROPROCESSOR POWERED ACCURACY - Advanced tech delivers reliable readings with ±2% precision, so you never second-guess purity.
OPTIMIZE YOUR FILTRATION SYSTEM - Instantly verify filter efficiency and membrane health to maintain peak water quality.
PRECISION WATER QUALITY INSIGHT - Dual sensors measure tap and purified water simultaneously for real-time filtration performance.

The HM Digital DM-1 In-Line Dual TDS Monitor offers professional-grade water quality monitoring with dual sensors that measure total dissolved solids (TDS) before and after filtration. Featuring a broad 0-9990 ppm range and ±2% accuracy, it provides instant, reliable data to optimize reverse osmosis, deionization, and other purification systems. Compact and easy to install with included fittings and batteries, it’s the essential tool for anyone serious about clean, safe water.

Specifications

ASIN	B001EHAZGW
Best Sellers Rank	#21,776 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #45 in Swimming Pool Water Test Kits
Brand Name	HM Digital
Customer Reviews	4.6 4.6 out of 5 stars (2,744)
Global Trade Identification Number	00891144000052
Included Components	Bag
Item Dimensions	1.9 x 0.8 x 3 inches
Item Weight	1.6 ounces
Manufacturer	HM Digital, Inc.
Material Type	Plastic
Model	716186
Number of Items	1
Part Number	DM-1
Set Name	DM-1 In-Line Dual TDS Monitor
UPC	733169337600 891144000052 885169394012 885156810310
Unit Count	1 Count

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