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

• High Accuracy- Unlike other competitors, Esee pH test strips offer 0.5 accuracy rather than 1 accuracy, maximum 4 colors panel that give you the most accurate results.
• Good Quality- Each pH strip is made of good quality litmus paper, won’t bleed like normal litmus paper.
• Full Range- pH test paper range from 0-14, pH color chart intervals: 0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,8.5,9,9.5,10,10.5,11,11.5,12,12.5,13,13.5,14
• Easy To Match And Read- 4 colors panel as a group to match against the color chart on the pack case, so it can be very clear to read the number and get pH result.
• Usable Anywhere- Suitable for testing pH balance of drinking water, pool, aquarium, RO system, Spa, or hydroponics; Appropriate for wide range of applications.