there so many kinda of ph testers, ask them what they think u need. u might want to think about geting one that can do PPM, and PH testing. go to the hard wear store and bye a compact florecent bulb, around 100 to 125 watt. then get that light like one inch from ur plant rightaway, its important, if u dont take care of that plant now,it will not take care of u later if u get my drift, its important to nercher to these little jerks as much as ya can.... so keep ur eye out for problems an happy growing,,,,