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$139.99 GR-100, 0-100% Glycerin Water Refractometer Sprinkler Antifreeze NFPA 13
$179.99 BOSS BGR-200 Professional Grade 0-100% Glycerin Antifreeze Refractometer
$179.99 BOSS BPG Professional Propylene Glycol Antifreeze Refractometer PG
$249.99 MISCO 7084VP PG & EG Glycol Antifreeze Refractometer Tester 'F
$299.99 Atago PAL-1 Digital 0-53.0% Brix Refractometer 32