ISTA CO2 Drop Checker Aquarium Carbon Dioxide Indicator

The ISTA CO2 Drop Checker is a simple and reliable visual indicator designed to continuously monitor carbon dioxide levels in planted aquariums. Using a colour-changing indicator solution, it provides an easy way to ensure your aquarium maintains the correct CO2 concentration for healthy plant growth and fish safety.

Made from high-quality transparent acrylic, the drop checker is discreet, durable, and easy to install using the included suction cup. It can be positioned anywhere inside the aquarium for convenient monitoring without affecting the appearance of your aquascape.

The indicator displays three easy-to-read colours, allowing you to instantly assess whether the CO2 level is too low, optimal, or too high.

Key Features

• Continuous visual CO2 monitoring
• High-quality transparent acrylic construction
• Easy installation with suction cup
• Can be positioned anywhere in the aquarium
• Clear three-colour indication system
• Simple and maintenance-friendly design
• Ideal for planted freshwater aquariums

Benefits

• Helps maintain the correct CO2 level for aquatic plants
• Provides instant visual indication of CO2 concentration
• Reduces the risk of excessive or insufficient CO2
• Easy to read without electronic equipment
• Compact and discreet inside the aquarium
• Simple to install and reposition

CO2 Level Indicator

The indicator solution changes colour to show the approximate CO2 concentration:

• Blue – CO2 level is too low
• Green – CO2 level is optimal
• Yellow – CO2 level is too high

Package Includes

• 1 × ISTA CO2 Drop Checker
• 1 × Suction Cup

Indicator solution is sold separately. ISTA I-691 Indicator Solution is recommended for refilling.

Technical Specifications

• Brand: ISTA
• Product Type: CO2 Drop Checker
• Material: Transparent Acrylic
• Installation: Suction Cup
• Suitable For: Planted Freshwater Aquariums
• Compatible Indicator Solution: ISTA I-691