AltimeterOne.

I bought this as a gift for a friend who is very into Rockets. He loved it, and on our first few flights the unit seemed to work perfectly. Very small, lightweight, and seems accurate. Great unit!

This altimeter works very well. Easy to set up and easy to operate, even with only a single button. The altimeter can show altitude changes in real time, or can be trigger upon assent. Once trigger, it watches for apogee to determine peak altitude. The altimeter shows relative change in altitude from the point where it is zeroed. I have tried this altimeter with low launch heights (60 feet) and it works great. I bought it for a weather balloon launch, but did not realize it only works to a certain height, not to 100,000 feet. Since it works well for rocket launches, I will try it on smaller rockets launching to a few thousand feet (once I have a decent recovery system).

I am a para motorist, this lightweight altimeter is great, weight is my biggest concern. Just lookingfor a secure mount, wright now Jolly logic is out of stock.

I needed to know the elevation of my house from the main water line so I would know where to insert a pump. This thing worked pretty good, I was surprised. I’m sure I will have a use for it later on. Only downfall is that it doesn’t measure elevation loss. I did compare the elevation gain to some maps I had and it was very accurate.

Unfortunately it has only 1 work mode that provides RELATIVE altitude to a point that you select to be zero,so I had to keep it on all the times to see absolute altitude at all times, and had to do zero - ing at a hight that was already known and back calculate everything, its a shame that it has only relative measurement mode.Otherwise it is top quality solid small long lasting

I purchased this altimeter after reading the Positive reviews. I needed an altimeter to measure the altitudes I fly several of my powered gliders. This unit performs perfectly & being quite small, has no detrimental effect on my gliders flight. The battery lasts quite long as I have been out on several outings without charging & not any issues. Highly recommend.

My 1st grade grandson used this for a model rocket science project that tested different weighs. He would recover the rocket after each launch and write down the max altitude for each weight. Its compact size really helped. Its easy to charge and install. We used three 1/8th inch holes in the tube. Very glad I bought it.

This little altimeter where is no more than a feather and works perfectly every time the price was right and I got to my house in short order I recommend jolly logic to anyone. I don't know how much better it needs to be my quad copter goes up and it tells me how high I flew I wouldn't spend any more for the better ones it does everything you needed to do