Nitrate, Amonia and Ph Scale

[Typ]

So with my tank i only have the filter the light and the heater. I want to buy the Nitrate, Ammonia and Ph scale but I went to a couple of stores and each were like 7 bucks each and last for 3 months. What do you guys use or buy? Any recommendations on the best and cheapest option? thank you

[f1oored]

Get a freshwater master kit. Petsmart.com has them for 14 bucks and they test...
High pH
Low pH
Ammonia
Nitrite
Nitrate
I've found this kit to be pretty accurate and there are like 800 test because it works with solution instead of strips.

[jeffs99dime]

api master test kit. if you go to petsmart, print the price off of the comp. before you go because they will price match. you should save about 50% over msrp.