$15 ones off ebay work fine for me. I'll take my chances on dropping it, or it not lasting forever.
supchaka Reviewed by supchaka on . Cheap TDS/PH meter? Anyone know where to get (online) a relatively cheap TDS and PH meter? ~40-50$ each? Local hydro store wanted 70$ for PH and 110$ for TDS!!! Hannas seem to be what people go with, but they are pricey! thanks. Rating: 5