What BTU meter?

Hi

What BTU meter would you recommend?

I would like to know what instrument would be good to take simple measurements working with rockets. Nothing fancy and expensive, just to have the options needed.

I searched eBay and the internets but didn't find anything specifically for wood stoves.

Best regards

Blendi

Here is what I use... bought on ebay (temperature gun non contact -58F to 1382F w/ Laser)
( 281387541995 ) cost was $ 21.88 works great just point and shoot. Fahrenheit & celsius

I have one of these, but I was wondering about something more professional. To read also ambient temperature, co2 levels and anything related to the rocket performance.

One brand is Testo. They have several models; Peter van den Berg uses a Testo 330 which gives all the measurements you want and a bit more, but I understand these are very expensive (thousands of dollars). I don't know if there is one that does those things for an affordable price.

Yes, I looked.

Cost is prohibitive, it's a shame that there is no other model to fit the needs of a normal guy doing this stuff.

Thanks for the info.

Blendi