Question 1

Does this TDS compensate for differences in temperature like the HM Digital TDS-4?

Accepted Answer

Yes if it was a real HM TDS meter but it is not.  It's a knock off.  Go to manufacturer's webpage and find a dealer in your area and order it there if you want a real meter.  
I spoke to the manufacturer HM DIGITAL today and they said the photo of this product is an original, but the product they ship is NOT.  The original real HM Digital TDS-3 have a printed instruction in black letters on the back of the meter that says "CALIBRATION" and has a screw to calibrate.  The knock-off simply has a hole and no printed words about calibration on it.  The original also has 5 bumps on each edge of the meter like the photo, but the one this seller ships does not.  Lastly, the real HM TDS-3 will display "HM" on the screen when you turn it on and then will display 00, but when you first turn it on will display HM.

Question 2

Where is this item made?

Accepted Answer

This is a a knock-off.  I spoke to the manufacturer HM DIGITAL today and they said the photo of this product is an original, but the product they ship is NOT.  The original real HM Digital TDS-3 have a printed instruction in black letters on the back of the meter that says "CALIBRATION" and has a screw to calibrate.  The knock-off simply has a hole and no printed words about calibration on it.  The original also has 5 bumps on each edge of the meter like the photo, but the one this seller ships does not.  Lastly, the real HM TDS-3 will display "HM" on the screen when you turn it on and then will display 00, but when you first turn it on will display HM.

Question 3

Does this teat for lead , mercury, cadmium and other metals? If so, does it tell you concentrations?

Accepted Answer

No, it does not test for any specific dissolved solid. It tells you the purity of the water only. In other words, how close is the water sample is to distilled water.

Question 4

The one I bought seems to work however it has no way to adjust it there is a hole in the back but no screw is it a imposter?

Accepted Answer

That's because it's a knock-off.  I spoke to the manufacturer HM DIGITAL today and they said the photo of this product is an original, but the product they ship is NOT.  The original real HM Digital TDS-3 have a printed instruction in black letters on the back of the meter that says "CALIBRATION" and has a screw to calibrate.  The knock-off simply has a hole and no printed words about calibration on it.  The original also has 5 bumps on each edge of the meter like the photo, but the one this seller ships does not.  Lastly, the real HM TDS-3 will display "HM" on the screen when you turn it on and then will display 00, but when you first turn it on will display HM.

Brand	HM Digital
Special Feature	High Accuracy
Color	Style 1
Age Range (Description)	Adult
Included Components	Carrying case
Outer Material	Metal
Specification Met	Tds
Display Type	LCD
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Power Source	Battery Powered
Model Name	TDS-3
Number of Batteries	2 LR44 batteries required. (included)
Item Length	1 Inches
Upper Temperature Rating	9.99E+3 Degrees Celsius
Reusability	Single Use
Resolution	1 ppm
Style	Contemporary
Indoor/Outdoor Usage	Indoor
UPC	891144000083 826333000001
Global Trade Identification Number	00826333000001
Manufacturer	HM Digital
Part Number	TDS-3
Item Weight	0.007 ounces
Item model number	TDS-3
Batteries	2 LR44 batteries required. (included)
Is Discontinued By Manufacturer	No
Size	0 - 9990 ppm. TDS Range, 1 ppm Resolution, +/- 3% Readout Accuracy
Pattern	meter
Item Package Quantity	1
Number Of Pieces	10
Temperature Range	0/80 Degrees Celsius
Measurement Accuracy	1
Special Features	High Accuracy
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Average Battery Life	3 Hours

HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy

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