Coralife Deep Six Hydrometer for Aquariums Puppy Package Each battery charge lasts 3-6

Each battery charge lasts 3-6 months

Virtually indestructible

The 1900S is also available in the 2-dog system 1902S

structures with metal siding or structures with metal roofs

The sack makes the noise of a paper bag that all kitties love

Coralife Deep Six Hydrometer for Aquariums Puppy Package Each battery charge lasts 3-6With its durable construction and easy to read scales, the Deep Six is guaranteed to provide years of reliable performance. Designed to give temperature corrected readings in warm water aquariums, readings can be read in ppt and specific gravity. The Deep Six is accurate to + 0. 001 specific gravity. Features: Every unit is pre calibrated and individually tested for guaranteed accuracy. Easy to use with a new, revolutionary self leveling feature. Wide