Does anyone have instructions for this tester? I have had mine for two years and can’t find the instructions.

Not sure if website links are allowed, but here is the link to the PDF manual. http://hmdigital.com/wp-content/uploads/2016/11/ap1manual.pdf

which conversion factor does this meter use to convert EC to ppm 500 or 700?

The website says 0.5 NACL which leads me to believe its 500. I think 700 measures a different solid other than nacl.

can you use this to check colliodal silver ppm???

Yes, I use it for that purpose. I really like this tester. It is accurate when compared to another meter I have that has been calibrated for reading silver levels. If you are going to purchase this meter I would suggest adding a TDS Calibration Solution as well.

ASIN	B007KDYOMU
Additional Features	Digital
Age Range Description	Adult
Age range (description)	Adult
Brand	HM Digital
Brand Name	HM Digital
Customer Reviews	4.2 out of 5 stars 1,632 Reviews
Display Type	LCD display
Global Trade Identification Number	00891144000120
Included Components	Battery
Included components	Battery
Indoor Outdoor Usage	Indoor
Inner Material	Magnetic
Item Weight	0.18 Pounds
Item height	1.1 inches
Manufacturer	HM Digital
Model	HMDAP1
Model Name	HMDAP1
Number of Batteries	1 Lithium Metal batteries required.
Outer Material	Plastic
Outer material	Plastic
Power Source	Battery Powered
Product Care Instructions	Wipe Clean
Resolution	1 ppm
Response Time	500 Milliseconds
Reusability	Reusable
Special features	Digital
Specification Met	TDS
Specification met	TDS
UPC	891144000120 807032971472
Unit Count	1.0 Count
Upper Temperature Range	80 Degrees Celsius

HM Digital - HMDAP1 AP-1 AquaPro Water Quality Total Dissolved Solids r, 0-5000 ppm TDS Range, 1 ppm Resolution, +/- 2% Readout Accuracy (Magnetic Body)

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