Features: There are 2 types, with and without backlight, choose according to your needs. OOTDThe can measure ORP, H2 and Temp with high precision at the same time. With data hold function, C/f switching function, built-in 3x1.5V button battery. Ideal for home and laboratory testing, including drinking water, swimming pool, pond, aquariums, etc. Small size, portable, you can carry it with you wherever you go. Specification: Material: PlasticSize: About 178x2 6mm/7x1in Type: Backlight/No Power Supply: 3x1.5V Button Battery (Included)Package Included: 1x Water Quality TesterNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.