I have wrecked 3 tire pressure checkers with the ballast fluid (water only) despite having the valve at the top of the tire! How does one avoid this problem?
It takes only a few drops or some spray to cause the damage.
Stainless steel guts probably. I would still worry about crystals if it sat unused for a few weeks.I have used my Milton 976 on CaCl tires for six years and on Rimguard tires for four years. I have never rinsed it out and it still works very well.