Testo 0563 2061 Compact pH1 Meter Instrument Kit, 0 to 14 pH Range, +/-0.02 pH Accuracy, 0.01 pH Resolution pH measuring instrument for fast checks on liquids Maintenance-free gel electrolyte Built-in temperature probe Automatic full-scale recognition TopSafe: Robust, water-tight, hygienic and dishwasher-proof protection case (IP68)