Jolly Logic 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).

Works like it should. Small and light weight, perfect for smal to large rockets. The signal button can be a little confusing until you get the hand of clicking versus a long press.Pro tip: tie a bright streamer directly to this in case your shock cord breaks. You will have better chance of recovering it.

The product is very easy to use, but seems overpriced for the simplicity of the technology. We had to buy the product for a 4H rocketry project otherwise I would not spend this much money on such a simple contraption.

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.

I bought this to use for a junior high science class I teach. My students were tasked with building a water bottle rocket of their own design with the goal of launching the rocket as high as possible.Unfortunately, this did not record the height of their rocket launches. I followed the instructions to set the altimeter and attempted to record heights on at least 5 launches with no luck. Also, this altimeter cannot handle ANY moisture. The field we launched the rockets in had a layer of dew that got the altimeter slightly wet. After only a few launches, the water seemed to get into the display, making it practically unreadable.I would have tried to initiate a return, but being a teacher these things tend to slip your mind.

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.

Wow Wow Wow This thing is incredible, We used it to survey a water system for a remote village in a third world country and took measurements over about 3 kilometers with height differences of 205 mtrs (not feet) in total. We rechecked the measurements in reverse on another day and they were accurate to within a foot.I spent a lot of time trying to find something to do this job, it is outstanding. Take measurements quickly before the weather changes or what is best just reset at every way point (DO NOT TRUST A GPS) we found this out the hard way.Every person who is doing these sort of projects MUST have one of these.