Dec 15 2010

Review: Pieps 30° Plus inclinometer

If you have reason to measure slope angles accurately, you would be hard pressed to beat the convenience of Pieps 30° PLUS. It’s a small, light device that measures slope angle in any orientation quickly and accurately. How does it work? With some electronic wizardry on a chip that measures gravitational acceleration in three axes. Power comes from a non-replaceable lithium battery Pieps claims will last at least five years. It has no off switch, but conserves energy by only staying on for about 30 seconds each time you turn it on.

Fast and easy angle measurement for $100

Besides being light and mounting to any commercially available ski pole using a pair of Velcro straps I like how I can hold it in any orientation, as long as I can read the display. It was developed primarily for avalanche pros and snow science hounds who want a fast, accurate way to record slope angles. For me, it was the perfect tool for seeing how accurate my estimate was of my preferred Meanderthal skin track angle, and equally as interesting, the average attack angle of the typical guide skin track and Neanderthal skin tracks found on the shores of Lake Tahoe, the Cascades, Rockies, Sierras, Tetons and Wasangeles ranges.

Bela Vadasz, who has developed the Ski Mountaineering program for the AMGA says they teach their guides to maintain a track with an ascent angle of around 15 degrees as optimal. I’ve followed the tracks set by many guides and while 15° may be what they are taught, the majority of guides tend to set a track closer to 18°. Only those with glacial experience seem to even know how to hold an ascent line less than 15°. While it may seem like nitpicking to make issue of only 3°, such a different is easily noticed, far more than you would think.

John Holleman and Dan Belanger in low gear.

It should be noted that 15° tends to be the angle rando racers prefer, allowing an economy of aerobic energy while moving steadily upward for long periods of time. This is the fastest way to travel through the mountains. If it weren’t racers would adopt a different angle of attack.

Myself, it seems my meanderthal tendencies clock in around 13° to 15° for a long climb, with short pitches up to 20° thrown in for variety as terrain demands. This is a step up from the days before free pivots were available to pinheads, and much appreciated. It remains however, noticeably lower angle than racers, and slower, but it shares the long-run advantages. Competitive folk definitely like to log an ascent angle of 20°+ on average, with extended pitches above 25° just to prove they can and followers can’t. I can, but usually won’t. It is worth noting that even the chargers who like setting steep lines will prefer my meandering track if it’s already plowed and, now that I have the freedom of a free pivot I have increased my typical old-man skin angle from 10° to 13°. It doesn’t sound like much, but it is absolutely noticeable.

But I digress. The main reason I like the Pieps 30° PLUS, and you may too, is how fast and easy it is to measure angles. If you know what you’re doing you can estimate angles with your ski poles; not all that accurate, but a quick way to ball park angles if you practice (and know your trigonometry). A popular model featured by several manufacturers uses a ball bearing inside an oil filled cylindrical arch. Fairly fast and accurate, no batteries required, and cheap. Great for patrollers, but recreational skiers will tend to leave such widgets in their pack. The Pieps 30° PLUS give angles within 1° accuracy, and the measurement settles out in about two seconds. Perhaps most important though is how accessible it is. Cinch it to your pole and it’s right there by your hands, ready to be used.

Besides slope angle, in any 3-D orientation, the 30°PLUS also reads the outside air temperature in Fahrenheit or Celsius.

The only thing I’m not too happy about is the fact that the battery isn’t replaceable. If I lose or crack this gadget I’ll be upset, but less so than if I have to spend $100 to replace it because the battery ran out. C’mon Pieps, it can’t be that hard to make the battery replaceable. Otherwise, what a cool tool!

MSRP: $99.95

  • http://www.thompsonpass.com Valdez Telehead

    That is truly the most practical slopemeter I have seen. I have dinked around over the years taping and glueing different size bubble gauges on my poles. They work for a day and then get bumped, loosen and errors occur. Having the slope angle constantly available at your finger tips is outstanding. No more excuses not to measure, A slopemeter is the backcountry skier’s key to safe mountain travel in avalanche terrain IMO.

    With that said it is too expensive. When I first saw this post and picture I guessed maybe $40 or so and was ready to pull the plastic. The technology is not any more special than a digital watch so I hope Pieps reconsiders the price of this critical device. I found a slightly larger similar device(no velcro) specific to carpentry for $50 at Home Depot.

    The battery thing is also an issue. But at least Pieps is on the right track in regards to slopemeters.

    I had a touring partner pull out his cell phone and measure the slope angle with one of his apps. I about fell over. Not sure how dependable that is.

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  • Lars

    Have anyone replaced this battery themselves? Mine is out of juice, and I don’t want to toss the whole thing away…