Appreciating that recommendations will usually state that Brake Fluid should be changed every two years.

Has anyone used / seen / have knowledge of, validity etc of one of these pen type Brake Fluid Testers. 

https://www.ebay.co.uk/itm/125017843656?_trkparms=ispr%3D1&hash=item1d1ba4e7c8:g:KBQAAOSw8pFhaYtI&amdata=enc%3AAQAGAAACoPYe5NmHp%2B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSxXDXcCydCuSj2Tq2S%2F3GnsEbN3IdNwhMU%2FJGCuYXmHtZ3vVbagbVK4lgAJHo5wEUaAC1l49LqQUEtTPQcB9L6uksDgWiUPlvI0e6HwPVyfXHZGkBYDScLEzIpq20f4Jd38E%2BFEXGeFrn7QaD4Fi4IdgFt1NNdam7VHiz9iEqtGSIMcNuDmMcn5jjBVtTkFRJLbhplJBr8BJdAyTdgU6oas3oWEKk43fM9OQo37is1qTMundddn44x1LWv2gQzdn8IZNh4%2FuCcZEtzl5WJEcNZ7SLbTW9BBnp3%2FslmJdFLCFLphCBa6EvlNSj0O%2FfhNNAdYgh4UuoCe707%2Bppl2BPwT%2F9AuqzIfqnj%2BXwhRSjIW6%2B4aqDu8F%2Bn2luNVzeeEJMRloiEc3cumDyqH4vkEyNpe9HIl6%2FsUfIBMichwC5f9IJe3GEEDvXnz39z%2F8VoTyAbwV03FL%2FXYkJK35WADmPedUPCeJ0aknJVNXqqm8S1Twifj4Ge99EFkICsXTfZEO3rhCq3jakAci3qFzAKUbAHRh8J9dj05Ef9ZZT3E3eR5YxjZ4hQHKOYVOi4s4naMjUVHh5e3f7m8Idm49DST%2BEqFuvzYbMBpvOQRAKYtwuMv6DYbQTn3SkhMzcjGhgkPOLky5igMnaW8%2Fy8YDew9%2BMd67UqK90XccANLmB7%2BVDCcPCd94e6i0P0qb%2FawKls8KO8HB5%2FADRnrZs0z2HA0786K%2B5zA%2FazDy96%2Fxk84LtipY6b7zOjBpQu%2FjNUmZcWxaGplZRSnNPNPooHbhx8Dt4XyNBXRafCpDbGCxuqrrnG%2Fpa%2FP4QRwWm19nf9dVwWT8cOfAbbtnDvY9s8DFu3jqHgw%3D%3D|clp%3A2334524|tkp%3ABFBMvtTN6eRf

Best Wishes and Regards, John

I think any product that can promote regular vehicle maintenance checks such as brake fluid condition is a good thing.

More than often, the brake fluid is overlooked and should be changed at a minimum of every two years as it absorbs moisture (hygroscopic) and leads to decreased boiling point which can lead to a loss of brake pressure.

I say, go for it and handy addition to anyones tool box

On 2/23/2022 at 12:45 PM, Wrinkly said:

Appreciating that recommendations will usually state that Brake Fluid should be changed every two years.

Has anyone used / seen / have knowledge of, validity etc of one of these pen type Brake Fluid Testers. 

https://www.ebay.co.uk/itm/125017843656?_trkparms=ispr%3D1&hash=item1d1ba4e7c8:g:KBQAAOSw8pFhaYtI&amdata=enc%3AAQAGAAACoPYe5NmHp%2B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSxXDXcCydCuSj2Tq2S%2F3GnsEbN3IdNwhMU%2FJGCuYXmHtZ3vVbagbVK4lgAJHo5wEUaAC1l49LqQUEtTPQcB9L6uksDgWiUPlvI0e6HwPVyfXHZGkBYDScLEzIpq20f4Jd38E%2BFEXGeFrn7QaD4Fi4IdgFt1NNdam7VHiz9iEqtGSIMcNuDmMcn5jjBVtTkFRJLbhplJBr8BJdAyTdgU6oas3oWEKk43fM9OQo37is1qTMundddn44x1LWv2gQzdn8IZNh4%2FuCcZEtzl5WJEcNZ7SLbTW9BBnp3%2FslmJdFLCFLphCBa6EvlNSj0O%2FfhNNAdYgh4UuoCe707%2Bppl2BPwT%2F9AuqzIfqnj%2BXwhRSjIW6%2B4aqDu8F%2Bn2luNVzeeEJMRloiEc3cumDyqH4vkEyNpe9HIl6%2FsUfIBMichwC5f9IJe3GEEDvXnz39z%2F8VoTyAbwV03FL%2FXYkJK35WADmPedUPCeJ0aknJVNXqqm8S1Twifj4Ge99EFkICsXTfZEO3rhCq3jakAci3qFzAKUbAHRh8J9dj05Ef9ZZT3E3eR5YxjZ4hQHKOYVOi4s4naMjUVHh5e3f7m8Idm49DST%2BEqFuvzYbMBpvOQRAKYtwuMv6DYbQTn3SkhMzcjGhgkPOLky5igMnaW8%2Fy8YDew9%2BMd67UqK90XccANLmB7%2BVDCcPCd94e6i0P0qb%2FawKls8KO8HB5%2FADRnrZs0z2HA0786K%2B5zA%2FazDy96%2Fxk84LtipY6b7zOjBpQu%2FjNUmZcWxaGplZRSnNPNPooHbhx8Dt4XyNBXRafCpDbGCxuqrrnG%2Fpa%2FP4QRwWm19nf9dVwWT8cOfAbbtnDvY9s8DFu3jqHgw%3D%3D|clp%3A2334524|tkp%3ABFBMvtTN6eRf

Best Wishes and Regards, John

I bought one of these pens. They seem to work quite accurately. I have compared its reading and judgement of the condition of my Hydraulic Brake Fluid v using a Multimeter reading to judge the condition (water content) and have had the same result from both ways of measuring. Admittedly the reading is very good with well under the acceptable level of water content, but I have not tested any brake fluid that is below an accepted level. Mainly because I have non, thankfully.

Regards and Best Wishes, John