Hold up, is this really a common problem? I get that wind changes with height, but on a normal clear day, is the difference at 200 feet enough to turn a safe lift into a dangerous one? Most of those ground meters have a factor built in for height, right? I've seen guys fly flags on the crane jib itself as a cheap check. Seems like if it was a major issue, the safety rules would already require a high-up sensor. Maybe you just hit a weird gust that day.

I always carried the exact replacement line, but your fix is smarter for the field. A good flare and compression fitting can be a real life saver when you're miles out. I keep a small tubing kit in my truck now because of stories like this.

Thought it was all marketing until my own refractometer showed similar over-concentration.