TDS meters on ebay

hey yall, i just ebayed TDS meter on ebay and a whole buncha stuff came up, ranging from 15-40bucks, these anygood? or are they just pieces of shit for super cheap cause im lookin to buy a tds/ec meter, maybe one that does PH if i can find it cheap enough but i dont really want to spend more than 50$, and most online places with these testers brand new are like 100ish

any suggestions at all plz?

cheapie digital ppm/tds pens work OK. they usually aren't calibratable, etc.

you can probably buy a ppm pen and a ph pen cheaper in seperates than you can together in one pen.

good luck

bt dt

sunleaves tds is great.

i found a good tds meter on ebay called a "hanna primo" for like 15 bucks. they were so cheap i bought 2 thinking that they would messup pretty fast, but im still useing the first 1 i opened about 1 year later. they even come with alil packet of calibration liquid. i have to calibrate my meter about once a month so that calibration liquid has lasted better than a year also.
i also bought a milwalkie ph/tds/water temp meter from a friend that stopped growing. i got it used for 20.00, but it was a 300.00 meter new. my cheapo is never more than 5 points off the more pricey meter.