Malloom Portable Digital PH Meter Tester Accurate Digital LCD Pen Size:155*29*16mm, Power Supply: 2*1.5V Batteries(Not included!!!) Fast and accurate results. No guess work as with those annoying color charts and test strips. Great for kids school science experiments. Test different bottled waters or even your homemade sauerkraut. Super convenient for monitoring pool and spa or aquarium. Turn it on insert in liquid, read display