Cool-Trak 311519 Coolant Testing Strips - Set of 50

Great and easy to use. My only concern is how they might measure up against the system our dealer uses. Don't know?? All said though, I had the same conclusion as the dealer. So it's a win at this point. Good luck.

I had an opportunity to test these strips against a pro-grade refractometer. I had an HVAC tech over the other day to help me raise the polyethelene glycol concentration in my radiant heat system (it had become slightly diluted after 10+ years).Over the course of an hour we compared readings about 7 times as we brought up the concentration. Since he had the more accurate device, I'd call out my reading first and then he'd share his. I was within 2-3% of his concentration readings each time ... and I had a ph reading as well.Now to be fair, I got better over the series of trials because I could calibrate my readings off of his. But even so, you should be confident that you can be within 5% in a concentration estimate without the benefit of a refractometer (as long as you are not color blind).But I did notice that the bottle has an expiration date ... as it should, since the chems on each strip won't last forever. I think the exp date gives you about three years, and with 50 strips, you'd need to test a lot of glycol to go through a bottle in that time. So buy a bottle and share it with a friend, and keep your eyes on that expiration date !

I bought this mainly for determining the concentration of glycol after conducting a fluid change. I have 2 of the ball-type indicators and found them both unreliable and difficult to use. This product seemed to provide accurate feedback of my Peak Global (green) glycol concentration. Given the price point when compared with competing products I would say this is a good deal for home use.

It agreed with my "pro" specific gravity type tester as far as temperature protection, so I hope the Ph test is also as accuratewhich measured 8 in both my car and my sisters car. Go to the website FAQ[...]To find out how to interpret the Ph readings, a bit silly that they have no explanation on the bottle.

I change my coolant religiously at the 30k mile or the 2-year mark (whichever comes first as recommended) for my 1995 Nissan Pathfinder. It had been 2 years and I took my truck in for my mechanic's inspection for the coolant change. He told me the coolant was in real good shape and no need to flush it just yet.Me being me, I was just curious and wanted to test it a bit more for my own eyes. These strips told me exactly what my mechanic did. And, as advertised by the product, in only 30 seconds. Extremely easy to do, 'even a cave man can do it.' I'll be using them again and again and with a set count of 50 it should hold me for a while. Seems to be an accurate and very fair priced product.

Would have given the product five stars, except for the fact that It is not mentioned in the write up that It is not recommended for use with Red or Orange coolants. Also my bottle has an expiration date of 06/ 2018. There is now way I will use 50 strips by that date. A bottle of say 15 or 20 count would be much more practical for home use.

Hi, you do not need to be a mechanic to use these test strips. Just make sure the car is cold when you check your anti-freeze/coolant. I test my coolant 2 times each year (spring/fall) and all my families cars also. This will show the condition of your system also befroe you have trouble on the road. The bottle of 50 will last a few years for my usage so I keep them in dry controlled area in basement.

I rarely leave reviews, but this product’s quality and simplicity motivated me to do so. It made testing the propylene glycol coolant in my construction equipment enjoyable. I’ll confidently use these with my $100k fleet.