Aquarium Drop Checker Horn Shape CO2 Indicator for Planted Tank
 
Horn Shape Design
Includes Mounting Suction Cup
Approx size: Height 1.5" inches, Width 1" inches at base/mouth, 3/4" Inch at Liquid Reservoir 
Approx size: Length from with Suction cup 2" inches 
 
Note - Indicator Fuild sold seprately