![](http://www.alamy.com/thumbs/6/BA2627C5-B9B3-4F08-8CAB-60DC4E4E434E/2EJGWAY.jpg)
Science. A boy is holding test ph strips to test the water in the aquarium
Size: 5974px × 3983px
Location: Germany
Photo credit: © lenade / Alamy / Afripics
License: Royalty Free
Model Released: No
Keywords: acid, ammonia, analyze, aquarium, balance, biologie, boy, bright, change, check, chemistry, child, childhood, chlorine, chmical, cichlids, close, color, control, display, equipment, examination, experiment, fish, fishes, fishtank, fluid, hands, health, home, indicator, kit, malawi, measure, monitoring, paper, ph, quality, research, science, scientific, scientist, solution, stones, stripes, test, testing, tube, water