📏 Highly Efficient Slide Rule Review

Very cool slide rule is great. It contains all sorts of formulas and equations. Ohm's law and more, troubleshooting txv. Such things. There's even a point and ductor diagram. Really well built. Easy to read and use. My edges are starting to crack a little. But overall a great part for the service car or in my tool bag.

Good companion for HVAC professionals. Contains a lot of useful information in a small package. Very well presented. Also has many electrical formulas. Good refrigerant troubleshooting information for new technicians. I like to have this with me when checking airflow to check size. Also comes with a barcode scan for a free app download. Thanks for that.

Great product in itself, my husband used it at school, likes the information and ease of use. The problem with this is that there is a Revain sticker on the back which makes some areas unreadable. It was a warehouse deal, but the Revain decals have more damage than the wear and tear listed. I'm trying to find a replacement for Revain.

"Super Cool" ; not even begin to describe the information packed into this card. The most useful tool I've come across in a long time. No specialist, no matter how long he has been in the trade, should do without this practical tool. I've been in the trade for over 20 years and I don't know how I lived without one for so long. Just got it a few days ago and it's already paying off in the time saved. And don't forget the app, lots of useful information and videos.