Easy pH Test Kits are litmus paper for testing pH balance in the body. This may be indicated for those who are sluggish, tired, have frequent headaches, poor recovery from exercise, poor digestion and weight problems.<BR><br>EASY pH Refill is the test kit only and contains litmus paper for 90+ tests. This product is best for those who are familiar with pH testing and as a refill for those who already have the Easy pH Booklet from the Easy pH Test Kit with Booklet. It is also ideal for practitioner supply for clinic use.