how do u use a tds meter

can ne1 please tell me what my tds reading should be,ive just got a meter and its reading 168,dont know if thats right for 4 week old plants.

cheers guys

they are useful tools,but there is no standard settings,each brand measures a little different than the other,making them somewhat confusing to use,but these charts may help you sort it out....bonbon

http://www.marijuanagrowing.com/article.php?sid=24
http://www.simplyhydro.com/tds-ec.htm

im even more confused now, :) but my reading is now 490,not sure if thats right

thanks again 4 your links tho

tell me who makes it and the model,i will ask a couple of friends of mine who'll know for sure....bonbon

yeah its a hm digital meter 3,like this one

http://www.tdsmeter.com/products/tds3.html

cheers m8

heres how you use the type of meter you have and nute levels....bonbon
http://www.overgrow.com/growfaq/1240
http://www.overgrow.com/growfaq/73

yes bon bon ,nice1 m8,ill sort it out right away

thanks 4 your time :)

y is it that when i get my reading to 500ppm with my nutrients i put the acid in to bring the ph down and the ppm reading goes up to 1200-1300? it makes it really confusing when topping up a 20 litre tank.

cheers :)