From the product description, check product page for current description, price and availability:

• USER-FRIENDLY: the URCERI PH meter is easy to operate; simply switch it on, remove the protective cap, and immerse the tip in the liquid
• WIDE APPLICATIONS: the URCERI PH meter can be used widely in different fields: laboratory, aquarium, pool, aquaculture industry, and so on
• AUTOMATIC TEMPERATURE COMPENSATION: can accurately determine pH value of the sample at any temperature in a range of 32°F – 140°F (0°C – 60°C)
• LIGHTWEIGHT AND PORTABLE: designed to fit in your pocket with an integrated clip on the back: allow you to clasp it onto jackets or bags
• NOTICE: to enhance accuracy, remember to replace the protective cap after using the digital meter to prevent the electrode from drying out