Thexton antifreeze tester THE106 — disc-type handheld, temperature-compensating for ethylene-glycol coolants

Thexton THE106 is a disc-type anti-freeze tester that quickly measures the protection level of ethylene-glycol engine coolants, hot or cold, using magnified floating discs for easy, accurate readings.

Keep your cooling system working efficiently with a handheld, temperature-compensating tester designed for mechanics, DIYers, and fleet maintenance. The Thexton THE106 evaluates ethylene-glycol based coolants — including Dex-Cool — and displays results on both Celsius and Fahrenheit scales. Its convex SAN plastic barrel magnifies the floating discs to make readings simple, while the one-piece bulb and neoprene dip tube ensure reliable sample draw without extra attachments.

How does this tester tell me if my coolant is protected?

The THE106 uses a series of floating discs that rise according to the freeze point of the coolant sample. Each disc corresponds to a protection level, and the specially added sixth disc signals when excess antifreeze begins to reduce cooling and corrosion performance.

• Disc indicators show protection levels at common freeze points.
• Sixth disc flags over-concentration beyond roughly 70% antifreeze.
• Readable scale in both Celsius and Fahrenheit for international use.

Will readings be accurate if the engine is hot or cold?

Yes — the tester is temperature compensating, so it provides correct results regardless of the coolant temperature when sampled. That makes it suitable for quick checks in the field or at the shop, without waiting for the system to cool completely.

• Designed for reliable measurements from hot or cold samples.
• Quick sample draw with one-piece bulb and neoprene dip tube.
• Clear barrel magnifies discs to reduce reading errors.

Can it test modern coolants like Dex-Cool and what fluid type is supported?

The THE106 is built to test ethylene glycol based coolants, which covers most traditional and many modern formulations including Dex-Cool. It is not intended for propylene-glycol specialty fluids unless specified by the coolant manufacturer.

• Compatible with ethylene-glycol coolants, including many OEM formulas.
• Not formulated for testing unrelated fluids or non-glycol-based coolants.
• Useful for routine maintenance checks and pre-season inspections.

What physical features make it easy to use and store?

The tester’s compact disc-type design and convex SAN plastic barrel combine to create a portable, durable tool that’s simple to read and stow. The integrated bulb and neoprene dip tube eliminate the need for additional parts and speed up sampling.

• Convex clear barrel magnifies discs for clearer readings.
• One-piece bulb with neoprene dip tube for quick sampling.
• Small footprint for toolbox or service cart storage; package dimensions compact for easy handling.

Who is this for? Technicians, fleet managers, and vehicle owners who need fast verification of antifreeze concentration and freeze protection will find the Thexton THE106 useful. It’s ideal for routine maintenance, seasonal checks, and pre-winter inspections when accurate, temperature-independent readings and quick sampling are required. If you work with ethylene-glycol based coolants and want a compact, reliable tester that highlights both under- and over-concentration risks, this tool fits the need.