P.P.M. digital meter vs Hydrometer

[ocyoo]

May I use a digitalPPM meter instead of a hydrometer?

 

[pbienkiewi]

PPM meter, parts per million meter? which is a TDS total disolved solids meter. A TDS meter is used to check RO/DI water. It is used to see how purified your water is. A hydrometer is used to how salty your water is. A Refractometer is better than a Hydrometer because it tests for Specific gravity. A refractometer is the way to go.

 

[see money]

are there such things as digital meters for ammonia? ph? nitrate? nitrite? calcium? etc. maybe a all-n-one?

 

[pbienkiewi]

All in one no. The instrument needs to know what it is testing for. They are individualized. They have individual ones for PH, Temperature, Calcium, Phosphate, Nitrate, Salinity, o2 level. I am not sure what others I am missing. These little monitors do get expensive. $100 - $250. Imagine what a ALL in one instrument would go for. WOW

 

[errattiq]

I think milwauke intruments makes alot of those digital meters, definitely pricey. I was looking at a nitrate photometer for like $200+. I'm still undecided, definitely accurate, yet I don't know if its worth the $$ in the long run...