Vertech Altimiter watch. Tracks vertical and gives max vertical/minute between resets.
Avocet Vertech, it's old but works great,I send in for battery and test every 2 yrs or so...
I have an Avocet Vertech II. I thought I'd lost it at Kirkwood last Sun as I took off my jacket when I took a break in the plaza and it was gone when I looked for it. I looked through all my pockets and stuff and re-traced my steps to rack where I'd left my skis, but couldn't find it. Not only was I bummed since I'd recently had the battery replaced, I also had new band and 'carrier' (that band attaches to) installed since plastic had broken so I couldn't use it on outside of my jacket as designed for a while. And it was a gift from my wife many years ago.
After reporting it to lost and found, I spotted in under a dustpan leaning against the fence separating lost and found from our table. It may have fallen there where I dropped some of the wrapper from the Nature Valley granola bar they were giving away there. If it had fallen in the dustpan, it probably would have been lost.
I have not run SkiTracks for a few years as I ski a lot at Heavenly and Kirkwood when phone can spend some time searching for data signal. My older iPhone battery can no longer make it through the ski day if I listen to a lot of music, let alone run Ski Tracks. While both of those ski areas have EpicMix (or EpicMiss as it often misses a lot of runs). Monday at Heavenly, EpicMiss had 5 lifts/4.6K vertical while my watch had 25 runs/28.5K. Tuesday at NorthStar, EpicMix had 22 lifts/32,347 while my watch had 22 runs/32,490' vertical which is amazingly close.
Note that AFAIK Avocet no longer sells or services Vertech watches. The person that used to do the service for Avocet now does it independently (and quickly in my experience this Fall). I was wondering what their value is and saw a couple on Ebay, but neither were guaranteed to work. One was $14 and needed battery. The other was $35 plus shipping and sold as is.