Heating Collection

$Refractometer for testing glycol concentrations$

$Eclipse refractometer with refractive index scale$

$OPTi digital refractometer - Antifreeze (Ethylene Glycol °C / Propylene Glycol °C Protection)$

$OPTi digital refractometer - AdBlue® / Antifreeze$

$OPTi Digital handheld refractometer - Ethylene & Propylene %Glycol$

$antifreeze refractometer with additional battery acid scale$

$OPTi Duo Aviation refractometer (RI/FSII-ATC)$

$antifreeze refractometer with additional battery acid scale$