Battery Coolant Refractometer

Battery Coolant Refractometer

Product Overview

The Sper Scientific Battery Coolant Refractometer is an essential diagnostic tool for any automotive technician, mechanic, or vehicle owner. This precision optical instrument is designed to measure the freezing point of automotive coolants and the state of battery charge with exceptional accuracy. By analyzing just a few drops of fluid, you can quickly assess the health and performance of a vehicle's cooling and electrical systems.

This portable, handheld device requires no batteries or external power source, operating seamlessly in ambient light. Its robust construction and user-friendly design make it an indispensable tool for use in the garage, in the field, or on the production line.

Key Functions & Scales

The refractometer features three distinct, easy-to-read scales for comprehensive diagnostics:

1. Ethylene Glycol Scale: Accurately measures the freezing point of coolants based on ethylene glycol, the most common type of antifreeze. This helps ensure the cooling system is protected against freezing in cold climates and prevents boil-overs in hot conditions.
2. Propylene Glycol Scale: Provides precise freezing point measurements for propylene glycol-based coolants, which are often used in environmentally sensitive applications or as a less toxic alternative.
3. Battery Acid (Specific Gravity) Scale: Determines the specific gravity of the battery's electrolyte solution. This reading directly corresponds to the battery's state of charge, which is clearly indicated as RECHARGE, FAIR, or GOOD on the scale. This allows for a quick and reliable assessment of battery health.

How It Works

A refractometer works on the principle of light refraction. When a liquid is placed on the prism, the instrument measures the angle at which light bends as it passes through the sample. This angle, known as the refractive index, is directly related to the concentration of solutes in the liquid—such as glycol in water or sulfuric acid in battery electrolyte. The refractometer translates this measurement into a practical, readable scale.

Operation is simple: just place a drop or two of the sample onto the prism, close the cover plate, and look through the eyepiece to read the result on the illuminated scale.

Features and Benefits

• Durable and User-Friendly: The rubber-coated hand grip provides a secure, comfortable hold and insulates the instrument from the user's body heat, preventing temperature-related inaccuracies.
• Clear, Accurate Readings: The high-contrast, brightly defined scale and adjustable eyepiece ensure large, easy-to-read measurements every time.
• No Power Required: This fully optical instrument operates using only ambient light, making it reliable and ready for use anywhere, anytime.
• Built to Last: With proper care, the high-quality optics and robust construction ensure a lifetime of reliable, precise performance.
• All-Inclusive Kit: The refractometer comes with all necessary accessories for immediate use, including:
  • Calibration screwdriver and calibration fluid
  • Sample transfer pipettes
  • A soft cleaning cloth
  • Comprehensive instruction manual
  • A durable, protective carrying case

Technical Specifications

• Dimensions: 6½" × 1½" (165 × 38 mm)
• Weight: 3.0 oz (86 g)
• Model: Sper Scientific 300014

Measurement Ranges & Accuracy

• Ethylene Glycol:

  • Scale: 32°F to -60°F
  • Range: 10°F
  • Accuracy: ±2°F

• Propylene Glycol:

  • Scale: 32°F to -50°F
  • Range: 10°F
  • Accuracy: ±2°F

• Battery Acid (S.G.):

  • Scale: 1.15 to 1.30
  • Resolution: 0.01
  • Accuracy: ±0.01