PH and GH meters

[simonbrown403]

just bought a, hanna PH meter and a TDS3 total desolved solids meter, from sunstone globe.
just wondering if anybody rates them, esspecial the TDS3, whats it like for using in discuc tank???

or

 

[simonbrown403]

just bought a, hanna PH meter and a TDS3 total desolved solids meter, from sunstone globe.
just wondering if anybody rates them, esspecial the TDS3, whats it like for using in discuc tank???

or

this is the PH meter