Antifreeze & Coolant Concentration Tester Pen

Know your coolant's freeze protection level in under 10 seconds. This digital tester dips into your coolant reservoir and reads the antifreeze concentration, displaying the freeze protection temperature on an LCD screen — so you know if your coolant is diluted and needs topping before winter hits.

• Digital LCD display — reads in seconds
• Shows freeze protection temperature
• Works with ethylene glycol and propylene glycol coolants
• Auto temperature compensation for accurate reading
• Battery operated — no calibration needed