Vernier Caliper Digital 150mm Precision Measuring Tool for Accurate Results how to check ro water purity at home The digital display provides a The digital display provides a clear readout of the current temperature filter based purifiers are simple to use and can efficiently remove sediments and bacteria Vernier Caliper Digital 150mm large lcd display with dept gauge bar 4 way measurement inside outside height depth with hard plastic box for convenient storage extra button battery lr 44 with fine adjustment roller used for precision measuring in : mm and inches digital vernier caliper 6 inch 150 mm range :0 150 mm accuracy : + 0 5V LR44 (silver oxide cell) Note: Accutacy affected in environment exceeding 80% relative humidity