Specifications: Condition:100% Brand New Material: Liquid Wastes Color: As Shown In The Picture Size: Box: Approx.15Cm/5.9In(L) Application: Residual Chlorine And Ph Test. The Ideal Range Of Residual Chlorine In The Pool Water Is 1.0-1.5 Ppm; The Ideal Range For The Ph Of The Pool Water Is 7.2-7.6. Usage: Residual Chlorine: Rinse The Colorimetric Tube With Water To Be Tested And Fill It Into The Scale. Add 3 Drops Of Residual Chlorine Reagent, Cover The Lid And Shake It Several Times To Compare The Residual Chlorine Color Card Reading.&Nbsp; &Nbsp; &Nbsp; &Nbsp; &Nbsp; &Nbsp; &Nbsp; &Nbsp;Ph: Rinse The Colorimetric Tube With The Water To Be Tested And Fill It Into The Mark. Add 3 Drops Of Ph Reagent, Cover The Lid And Shake It Upside Down Several Times To Compare The Ph Card Readings. Package List: 1*Swimming Pool Water Test Box 1*Ph Reagent 1*Oto Reagent 1*Test Bottle Set Note:&Nbsp; When Testing Ph, If The Residual Chlorine Content Is Higher Than 3.0 Ppm, You May Get A Wrong Ph Test Result. In This Case, Reduce The Residual Chlorine Content Of The Pool Water Before Doing Any Other Tests. Warning: Store In A Place That Is Out Of Reach Of Children. Harmful If Swallowed, May Cause Burning, Store In A Cool And Dark Place. In Each Beginning Season, Please Use New Solution To Maintain Accuracy. Please Be At A Depth Of 40 Cm Below The Water Surface To Take A Water Sample.