Sun CompanyAltimeter 203 - Battery-Free Altimeter and Barometer | Weather-Trend Indicator with Rugged ABS Case and Lanyard | Reads Altitude from 0 to 15,000 Feet

Back in March I attempted a hike from Mt Piños to Grouse Mountain in the San Emigdio Mountains in Southern California. I encountered a lot more snow than I had expected. The trail was 99% ice and snow and maybe 1% bare earth. With MicroSpikes the footing was no problem, but, after I got past the footprints approaching Sawmill Mountain, I couldn't figure out where the trail was even though I had hiked it quite a few times before. I had a compass and topo map, I could see Mt. Piños clearly, but I could not find the trail. In a moment of imprudent overconfidence I took off over virgin snow along what really, really looked like it just had to be the continuation of the trail -- and wound up 15 minutes later in what I realized was the wrong part of the woods. I was solo at 8500' on a Tuesday morning on a snow-covered, wooded mountainside way off the beaten track. Feeling like a total moron, I deployed the remaining morsels of my 2-digit IQ, turned around, and went back the way I had come.Post mortem analysis made it clear that I had made the swing to the west at least 150' too low. This got me to thinking that knowing how high I was might have kept me better oriented. I researched the use of altimeters in hiking and discovered that others held similar beliefs.I looked at altimeter watches first, but they seemed ridiculously pricey and did all kinds of extra foo-foo stuff that was of no interest to me. Plus a lot of people seemed to have trouble getting reliable readings from any that had a sticker price under $300 -- and from some that cost considerably more. Plus, the watches all had to have a battery to power the display. In some models the batteries weren't even changeable by the owner. At one site a purchaser titled his product review, "Great for picking up chicks."I decided I needed something more fundamental, and a modest amount of research turned up the Sun Altimeter 203. I decided to give it a try. It has turned out to be just what I needed.The Sun 203 is a simple pressure altimeter with an analog dial calibrated in 100' increments from 0 to 15,000'. I feel like I can interpolate the pointer position and get a value within plus or minus 10' or so -- plenty good enough for orienteering purposes during mountain hikes. The instrument is robustly constructed from a molded polymer that looks like ABS, and it is not petite: It is 2 5/8" wide by 3 1/4" tall by 1" thick. It comes with an attached lanyard that I wear around my neck. The dial is large enough for me to read while wearing my distant vision glasses, and as I become more familiar with the instrument, it gets easier to read accurately with a quick glance while in full stride. Since I'm doing hikes with 3000' or more of elevation gain, I find it, if not helpful, at least comforting to know exactly how I am doing with the vert without stopping to look at the topo map.A pressure altimeter is basically a barometer with delusions of grandeur. It is really good at accurately sensing changes in atmospheric pressure, but the conversion of these pressure changes into actual altitudes is subject to two principal kinds of errors. On type of error is caused by changes in atmospheric pressure due to weather systems. You can sit in your living room and watch your altimeter tell you you are going down while a high-pressure cold front passes through. The second type of error is caused by significant changes in temperature. You can sit on your camp stool and take an altimeter reading at sunrise when it is 30°F, while away the day at the same spot until it is 75° that afternoon at which time the altimeter will tell you that you have ascended maybe a hundred feet or more. What you do about this is learn to understand thoroughly how these phenomena operate and re-calibrate your altimeter during the day whenever you are at a physical location where the altitude is known. Google "The use of altimeters in height measurement" for an excellent article about the use of altimeters while hiking in Scotland where both temperature and pressure are subject to considerable change on any given day.I've been hiking in the mountains of Southern California where the macro air mass has been quite stable and temperature changes have been moderate, and the Sun 203 has seemed to be just about spot on at every point of known elevation. My environment has been much kinder to altimeter accuracy than Scotland. What needs to be understood in all this is that the altimeter is not like a digital watch or a calculator. To get accurate information from an altimeter under every circumstance you may encounter while hiking you have to know a few things and make a few adjustments when circumstances warrant.I'm finding that having an altimeter along while hiking adds to my enjoyment. Maybe someday it will help me solve a knotty navigation problem like the one I bonked in March.Three more things you ought to know. First, The Sun 203 costs one fifth as much as the cheapest altimeter watch worth considering. Second, you can't change the batteries in the Sun 203 because it doesn't have any. It is 100% powered by atmospheric pressure forever. Guaranteed. And, last but not least, if a Suunto altimeter watch helps you pick up chicks, you won't be able to handle all the action you will get with a Sun 203.

I've had this altimeter for a summer's worth of hiking now, so it's time to review it. This altimeter is very lightweight, needs no batteries, is easy to adjust, and tells me what I want to know.I use it to track elevation during hikes, particularly during steep ascents or descents. It's good for my morale to know how much more up or down is left to go. It's easy to use for that purpose. It's only readable at best to 50 foot increments (the markings are 100 feet, so you can interpolate in between), but that's enough precision for me.I have found the calibration ring to be stable, meaning that it doesn't slip or slide when I take the altimeter in or out of a pocket. I set the altimeter at the trailhead, with known elevation, and then it's fine throughout the hike.I previously used a $300 Suunto hiking watch/altimeter. The batteries would periodically run out, and then they were a pain to replace. This Sun unit is much easier to use.

Great little altimeter. Purchased for hiking in Washington's Cascade Range, as my old altimeter had died.-- Sturdy construction-- Seems accurate, as much as a small mechanical altimeter can beThese things are actually barometers, with a moveable dial for converting barometric pressure to altitude. You calibrate this by turning the moveable dial when at a known altitude, such as a landmark whose altitude can be read from your map.Slight problem with this unit is the moveable dial moves around when the unit is in your pocket or pack, so you lose your altitude calibration. The old one's moveable dial was just about impossible to move by bumping the unit. I compensated with a piece of Gorilla Tape on the body, holding the dial, but this was less than a perfect solution.Unit was also slightly larger and heavier than I'd guessed from the Amazon page.It does the trick though, and I anticipate carrying it on hikes for years to come.

absolutely love this altimeter. no batteries all mechanical and very accurate, light weight and easy to read, fits in the palm of your hand. have used this a few times on hikes in the mountains and keeps me at the right elevation. also great for tracking rapid changing weather, i scene a big low pressure reading and set up camp just in time to ride out the storm. i highly recommend this over any electronic altimeter because it always works and doesn't have all the bells and whistles i didn't need.

Hey, this unit is clear, easy to use, and darned accurate. We live in the mountains, and got tired of everyone telling us what the altitude was. Well guess what most of you folks? You were close, but not as close as my new friend, Sun Altimeter 203. Checked it against State too maps too. Guess my other friends don't have any maps. Or an altimeter.

The dial is to easy to accidentally move while hiking thus giving you an inaccurate reading. I gave it to my kids to play with. I’ll stick with the app on my phone.

In a test drive from Palm Desert over the hills via Hwy 74, the instrument registered altitude in full agreement with the road signs. Note that it is used exclusively in cars. Ambient temp ranges 108-120℉

Perfect, no batteries, will work for a long time. Still works 2 yr later

works greatnice product

The altimeter works fine, and is very compact. After the winter is over the real test will happen when we travel or go hunting. thanks, Joseph