Instecho Pizza Scissors Cuts and serves foods such as pizza with one tool Long blade easily cuts through foods Left or right handed use Pulls apart for easy cleaning Safe to use in the dishwasher Measuring range: 0.00-14.00PH Resolution: 0.01 pH Accuracy:  0.1 pH Operating Temperature: 0-80 Dimension: 153mm x 29mm x 16mm Life expectancy: about 500 hours Relative humidity &lt;95% Digital pH meter with two key: On and off switch + Auto Calibration button Auto- One Touch Automatic Calibration; CAL - Calibration button just press the button to switch power, insert and stir gently in the test solution, then the LCD display with back light get stable pH value and temperature 050(32F~122F) within seconds, no more color c the pH meter with auto calibration button can automatically identify standard buffer solution of pH4.00, pH9.18, and pH6.86; its high accuracy 0.03pH range of error ensures more reliable results; automatically temperature compensation(ATC) ranges from 050(32F~122F) automatically to ensure accurate readings.harts or messy test strips. this pen-type instrument has a compact size, weighs only 1.76 oz (50g) that is perfect for outdoor or household use, ideal for testing drinking water, pool, aquarium, spa, or hydroponics. this product comes along with a detailed instruction about operation and pH calibration correction for your reference.