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
0.1 Pounds
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 sensors for real-time comparison

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Description

💧 Know your water, own your wellness.

RELIABLE ACCURACY - Advanced microprocessor technology ensures readings within ±2%, so you trust every drop.
EFFORTLESS INTEGRATION - Includes quick-connect T-fittings and batteries for seamless installation under sinks or coolers.
ULTRA WIDE DETECTION RANGE - Covers 0 to 9990 ppm, capturing everything from pure to heavily mineralized water.
OPTIMIZE FILTRATION PERFORMANCE - Monitor your system’s rejection rate in real-time to avoid costly filter failures and maintain peak purity.
PRECISION WATER QUALITY INSIGHT - Dual sensors measure tap and purified water simultaneously for instant TDS comparison.

The HM Digital DM-1 In-Line Dual TDS Monitor offers precise, real-time measurement of total dissolved solids in water with dual sensors for feed and product water. Featuring a broad 0-9990 ppm range and ±2% accuracy, it’s designed for easy installation in filtration systems like RO and DI, empowering users to monitor and optimize water purity effortlessly.

Specifications

ASIN	B001EHAZGW
Best Sellers Rank	#32,144 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #63 in Swimming Pool Water Test Kits
Brand Name	HM Digital
Customer Reviews	4.6 4.6 out of 5 stars (2,735)
Global Trade Identification Number	00891144000052
Included Components	Bag
Item Dimensions	1.9 x 0.8 x 3 inches
Item Weight	0.1 Pounds
Manufacturer	HM Digital, Inc.
Material Type	Plastic
Model	716186
Part Number	DM-1
Set Name	DM-1 In-Line Dual TDS Monitor
UPC	733169337600 891144000052 885169394012 885156810310
Unit Count	1.0 Count

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€ 44.64

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In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

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