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Yes, thats why your reading with this method will be around 10-15% lower than actual reading.However, if water is at room temp, this will start affecting more if you are trying to raise water temp by 10 degree or so. For 2-3 degree Delta not much of a difference.

For starters let me clear two things. You cannot measure power of a laser, or brightness output of a flashlight, or similar things, by just "looking" at a beam, or seeing how fast something burns etc., etc., Accurate measurements require specialized equipment. What if you don't have specialized...

I have updated the first post with common battery chemistry details.

Add me tsk1979 New Delhi, India

You will need the following 1. Domain name - upto 10$/year 2. Hosting space - 5$/month or 3$/month if you pay in advance for a basic plan from any big name sites. you do not need any dedicated server unless you are talking about millions of page views 3. Content Management system - Wordpress or...

You mean Liion, Lipo, NimH etc.,? My chemistry is a little rusty, lemme read up stuff, and will try to do so within the next 24 hours.

Thanks andy, I will add this cell also!

I wrote a short guide http://laserpointerforums.com/f67/common-battery-sizes-types-guide-83325.html

A short guide Batteries I created this after trawling the web searching for different batteries available AA and AAA 1.2-1.5V batteries, the most commonly used. Usable in low power flashlights, lasers(upto 100mW or so) and other small sized consumer electronic devices. Sanyo Eneloop is the...

Actually, that is not good. A high power red becomes a dangerous object, and looking at the dot on a wall, as well as stray hit can cause eye damage. If your purpose is astronomy, its best to go with a 10-15mw Greenie. Having a higher power laser pointer is not always a good thing, unless you...

Even a cheap 5mW greenie is good enough for star pointing. For red you need higher power. So for astronomy, green is definitely much better as our eyes are more sensitive to green light.

I put a video in fog machine thread http://laserpointerforums.com/f57/best-fog-machine-money-82713-2.html#post1200081

I got this one FandyFire UV-S5 CREE 3-LED White Flashlight - Yellow (XM-L T6 3-Mode 3000LM 4 x 18650) - Free Shipping - DealExtreme Awesome through. Outshines 60/55W car Halogen bulb. In dusty polluted environments like Delhi, you can actually see the beam shooting into the sky at night. Heck...

Don't bother online. For such cheap items shipping will cost more. for example amazon.com has sellers selling 6 boxes for 8$ (way too expensive) Then this guy sells 2 boxes of 12 cones each for 2.79$ Amazon.com: Satya Sai Baba Nag Champa Super Sandal Incense Dhoop Cones, Pair of 12 Cone Boxes -...

The beam is totally invisible without the smoke. But yes, its around 15-20mw actual(typical dx overspec) Thanks for the tip! corrected my post! In the indian store this type of incense is called "Dhooph" If you keep door closed and light up two, you will have a proper smokified room!

Thanks tony! Here is the link! Cheap 5mW 532nm Green Laser Pointer Pen with DX Logo (2*AAA)

Okay, today I purchased a pack of incense sticks, for 15 INR (less than 30 cents). The room was medium sized, with a big door kept open. Within 5 minutes there was enough smoke for the 5mw Greenie from Dealextreme(Could be around 20mW actual) for the beam to show with fluorescent tube light on...

Sure... will do. Get some today, and then post a video in this thread :)

Go to an Indian store and buy incense. Do not buy the "sticks". Buy the putty. It costs around 2-3rs in India, so 1$ will get you a lot in the USA. I plan to buy some here, and show its effectiveness. Not a good idea however if you are allergic to smoke. On the bright side, the room smells...

Since I am in India, there is nobody here :). But I guess this is one of the most commonly sold pen lasers, somebody must be having this. I will trawl through threads and see