Duo-Chek Refractrometer C (5000C) Coolant and Battery.
According to ASTM Method 3321 Standard Practice for the Use of Determining the Freezing point of Aqueous Engine coolants, the Duo-Chek refractometer is accurate to a level of +/- 1%. The Acustrip DCR500 duo refractometer is the perfect companion to the use of Acustrip test strips.
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