Features: There are 2 types, with & without backlight, choose based on your needs. Can measure ORP, H2, and Temp value with high precision- at the same for time. With data hold, ℃/°F switchable function, built-in 3x1.5V button battery. for Ideal for household and laboratory testing applications, including drinking water, swimming pool, pond, aquariums, etc. Small size, portable, you can carry it with you wherever you go. Specifications: Material: Plastic Size: approx 178x26mm/7x1in Type: backlight/non Power supply: 3x1.5V button battery(included) Package Includes: 1x Water Quality Tester note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.