Automotive Coolant Refractometer with ATC chillers-heaters-and-purification Maintains the original air porosity:

Maintains the original air porosity: the cells do not compact after continual watering

After dozens of lab tests and real world tests

Product Description: High-airflow ventilator fan designed to control the temperature and humidity levels of your crawl space

but not suitable for aeroponic or hydroponic recirculation systems

Automotive Coolant Refractometer with ATC chillers-heaters-and-purification Maintains the original air porosity:The antifreeze refractometer can be used for measuring the freezing point of glycol, antifreeze, coolant and battery acid. This refractometer features Automatic Temperature Compensation (ATC), and can also be used for checking the condition of electrolyte solution batteries. Measures the freezing point of automobile antifreeze based on ethylene glycol or propylene glycol. This is a quality optical instrument that includes a soft carrying case, bulb