PPM Meter

[Loc Dog]

Just realized my old PPM meter is measuring about 100 points high. Any recommendations on which to buy or avoid?? I am hobbyist with no income so nothing expensive.

 

[CertifiedRefugee]

Just realized my old PPM meter is measuring about 100 points high. Any recommendations on which to buy or avoid?? I am hobbyist with no income so nothing expensive.

G you still need help?

 

[coxnox]

clean it and re-test it
ppm meter allmost never die, only ph probe are.

 

[CertifiedRefugee]

Just realized my old PPM meter is measuring about 100 points high. Any recommendations on which to buy or avoid?? I am hobbyist with no income so nothing expensive.

I just upgraded for the new year. Here's my recommendation apera gro star GS4.

 

[Loc Dog]

I looked and the one I normally use is no longer sold. Has hole in back like PH meter for adjusting, but no screw to adjust. Have another one, but neither are close to reference solution unless it went bad from age. Even weirder is if I use dehumidifier water, the numbers jump around.

 

[Three Berries]

I bought a Inkbird one last spring that seems to be better than the cheap eBays at around $20. Bought a Apera that seemed to be quality but it's high range was only 1000.

Inkbird INK-TDSK4

 

[Ca++]

A PPM meter measures EC, and guesses PPM using math. Some tell you PPM, if it's salt water with the EC it's measuring. Some a blend of salts you might use in a salt water aquarium. There are 4 standards, with the common two being to take EC and times it by 500 or 700.

It is all nonsense. The meter measures EC, which is internationally recognised and used by people that get it. Any mathematical guess offers no real benefit. It's better to know what the meter actually reads, than be misguided by a misrepresentation in the form of a PPM reading. Which non of these meters can actually get right, at any price.

I'm really not interested in pretend science. An EC meter should read in EC

 

[goingrey]

I just upgraded for the new year. Here's my recommendation apera gro star GS4.

Nice it has both EC and pH