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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💧 Measure with Confidence: Your Water Quality Companion!

PORTABLE DESIGN - Compact dimensions (5.1L x 20.3W cm) make it easy to carry and store.
EFFORTLESS SETUP - Quick and easy installation means you can start measuring in no time.
FACTORY CALIBRATED - Enjoy reliable readings right out of the box with factory calibration.
ADVANCED TECHNOLOGY - Leverage cutting-edge microprocessor tech for accurate results.
PRECISION MONITORING - Stay ahead with dual TDS monitoring for feed and product water.

The HM Digital DM-1 is a state-of-the-art TDS monitor designed for precision and ease of use. With a dual range of 0-9990 ppm and an accuracy of ±2%, it provides reliable readings for both feed and product water. Featuring a compact design and advanced microprocessor technology, this device is factory calibrated for immediate use, making it the perfect tool for professionals who demand accuracy and efficiency in water quality monitoring.

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Brand	HM Digital
Product Dimensions	5.1L x 20.3W Centimeters
Measurement Accuracy	Accuracy: ±2%
Number of Batteries	2 LR44 batteries required. (included)
UPC	733169337600 891144000052 885169394012 885156810310
Manufacturer	HM DIGITAL INDIA PVT. LTD., HM DIGITAL INDIA PVT. LTD. Plot No. G1-375-376, RIICO Industrial Area, Khushkhera, Alwar, Rajasthan 301707, India
Global Trade Identification Number	00891144000052
Manufacturer	HM DIGITAL INDIA PVT. LTD.
Country of Origin	India
Item model number	716186
ASIN	B001EHAZGW

HM Digital DM-1

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