Review on 🐠 Glosso Factory Drop Checker Kit: Single or Dual CO2 Indicator for Planted Aquariums - Pre-Mixed 4.2 and 8.4 dKH Solutions by Sarah Dionne

Imperfect design, even the paint shaker could not pour solution into the ball. That's why they give you two, you break one trying to inject the solution. After getting my hands dirty with blue shit and using up half a bottle of the solution, I put it back in the box and sent it back. I've used a few other brands of drop checkers and never had this problem. They made the neck too small, it's not used to treat cancer, it's a damn hobby device for measuring CO2 in an aquarium. Unbelievable.