Is there a gH Pen?

[sateman]

I remember having read somewhere that there is this 6 in 1 pen that can measure pH, gH, etc...hmm can't seem to find the post. Is there a pen that do just that or at least can measure gH? I'm sick of using the API or Sera test kit as I can never get a good reading.

[ralliart12]

...I'm sick of using the API or Sera test kit as I can never get a good reading.

Me too, e.g. sometimes can't even be sure of the colour shades.

[Pork Life]

http://www.ecocityhydroponics.com/wa...ss-meters.html

[sateman]

http://www.ecocityhydroponics.com/wa...ss-meters.html

Thanks bro..but too pricey for me.