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.

Manufacturer	HM Digital, Inc.
Part number	DM-1
Item Weight	45.4 g
Product Dimensions	4.83 x 2.03 x 7.62 cm; 45.36 g
Batteries	2 LR44 batteries required. (included)
Item model number	716186
Size	0-9990 ppm; 1 ppm resolution (0-999), 10 ppm resolution (1000-9990)
Color	Blue & White
Style	In-Line
Finish	Brass
Material	Other
Power source type	Battery Powered
Installation Method	Click
Item Package Quantity	1
Number Of Pieces	1
Measurement Accuracy	2%
Display Style	LCD
Included components	Bag
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Battery life	1000 Hours

HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, 2% Readout Accuracy

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