| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| Ag8n | "The best way to test a HEPA filter is with an air particle counter. Thought I could borrow one from a local university. They do not have one. It..." | Read more » | almost 7 years ago | |||
| Ag8n | "In this area (Ohio), at least, trace levels of hypochlorite ( bleach) work their way into the storm sewer. If you have a piece of red pH paper, b..." | Read more » | almost 7 years ago | |||
| Ag8n | "You want to check the expiration date of the strips, first. If they are expired, throw them out. And beware. If you are using something like red ..." | Read more » | almost 7 years ago | |||
| Ag8n | "Another good place to check is the Reddit rtlsdr . It's also got a lot of info. " | Read more » | almost 7 years ago | |||
| Ag8n | "It's rtl2832u. It's a European dab tv tuner that had a troubleshooting mode built in it that could be modified for a bunch of other things. The cu..." | Read more » | almost 7 years ago | |||
| Ag8n | "Sorry, I got interupted. The rtlsdr work with computer, are low cost ($5-$25) and with suitable freeware and low cost software, can decode many de..." | Read more » | almost 7 years ago | |||
| Ag8n | "I don't know if you have a protocol in mind, but let me know exactly what you want. I also need to do some digging. May be able to find a particl..." | Read more » | almost 7 years ago | |||
| Ag8n | "How about using foam pipe insulation and adhesive for the frame? Then hold the filters in place with bungee cords? Maybe as a cost savings? " | Read more » | almost 7 years ago | |||
| Ag8n | "Something similar has been used as an improvised food dehydrator for years. See some of the old episodes of Good Eats. Wonder if the dehydrator w..." | Read more » | almost 7 years ago | |||
| Ag8n | "You're welcome. Hope it helps. Good luck with your projects. " | Read more » | almost 7 years ago | |||
| Ag8n | "Yeah, I'm still old school. That paper is the way for me! " | Read more » | almost 7 years ago | |||
| Ag8n | "It's very useful. Thank you for the information. Atomic emission is good, but for maximum sensitivity, you need variations. These are atomic abs..." | Read more » | almost 7 years ago | |||
| Ag8n | "Wondered about that. The main plant Had a storm sewer. One of the small satellite plants had something labelled a storm sewer. But, when the sam..." | Read more » | almost 7 years ago | |||
| Ag8n | "It gives a range of magnifications. As for sample prep- "samples were mounted in aroclor 5442 or the equivalent Carville refractive index liquid 1..." | Read more » | almost 7 years ago | |||
| Ag8n | "See below These are photos taken from" the particle atlas", second edition, volume II, by mccrone. " | Read more » | almost 7 years ago | |||
| Ag8n | "I checked the images. There are pictures of quartz and several for cristobalite. Didn't see one for tridymite. " | Read more » | almost 7 years ago | |||
| Ag8n | "Ok, are talking about the difference between amorphous silica and crystalline silica? The amorphous is generally safe and crystalline is generally..." | Read more » | almost 7 years ago | |||
| Ag8n | "I'm no expert on microscopy. Did mess with it a little. The difference I notice is a lot of the work is done with crossed polars- messing with th..." | Read more » | almost 7 years ago | |||
| Ag8n | "I do have a copy of edition two, which is four volumes. Volume 1 goes over microscopes, volume 2 gives pictures of the different materials, and vo..." | Read more » | almost 7 years ago | |||
| Ag8n | "One place to find these kind of devices is at pittcon. It is THE convention for analytical chemists. It takes place in Orlando, Fl on Feb 26- Mar..." | Read more » | almost 7 years ago | |||
| Ag8n | "Got it! It's at: Https://www.grc.nasa.gov/www//k-12/airplane/kitesag.html It also has a link to a program called kitemodeller, since the math for..." | Read more » | almost 7 years ago | |||
| Ag8n | "May not work with those sensors, but.. Many of the weather stations can be wirelessly received with an rtlsdr ( they cost about $20). The program a..." | Read more » | almost 7 years ago | |||
| Ag8n | "Time for me to start dusting off Raman stuff. " | Read more » | almost 7 years ago | |||
| Ag8n | "I checked Amazon. There are several tds meters that also do conductivity for a price of under $20. Since a scientific model lists for about $1000,..." | Read more » | almost 7 years ago |