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I have a black box that blue led no longer come on. Are the power cords interchangeable?

The directions for this refractometer states to use distilled water for calibration.

So i have been in the hobby a long, long time but I am far from an expert. i say this because I still hang onto doing some things "the old way". For years I have used the swing arm hydrometer to test my salinity. I have owned a refractometer but never really used it much. Again my tank is...

Id like to be next in line if you find one. I have a 220 full of them.

If still available and you would like to donate to a school setup I will take them.

I am interested. I can pick up Monday evening.

Some pictures.

Coral Reef To Classroom is finally in full swing again. I have another group of students this year meeting once a week for STEM classes and reef keeping activities. The tanks are set up in a science class and one tank is set up in the school lobby. All students in the school are excited and...

Herb Seems I saw this post too late. Please keep me in mind if you plan to give away anymore equipment. I have a couple of reef tanks set up at my school. Donated supplies and equipment would greatly help us out. Thanks

interested in fluval 13.5 if Mark doesn't take it.

James Using a Raspberry Pi was suggested to me a while back by a friend of my sons but he had a hard time explaining how I might incorporate it in a lesson or project. Thanks for the suggestion and I hope to use you as a consult when I am ready to start such a project. Can you suggest helpful...

I definitely plan to try LED lighting projects. It will allow me to cover many different science topics. I was thinking about using materials that do not require soldering hoping that I will be able break down and reuse the parts for multiple lessons.

Good morning. Thanks so much for the warm welcome and offers of support. I am looking for DIY project ideas that I could use involving students in my STEM program. If you could include approximate cost and source of materials that would be helpful. Thanks again. John

I have to attend a graduation in the morning that day. May be tough, but I will try to come by. What time will things start to wind down?

Our STEM tank

Mark I am a seventh grade science teacher in North Brunswick and I reside in Howell which is why I am focusing on middlesex, monmouth and ocean counties. My focus will be primarily middle school grades but will consider elementary and high school as the program expands. The idea is to get an...

Seeing his setup is definitely worth the trip and you are supporting a great program by participating in the frag swap.

Marcus thanks so much for joining our class last night. You were a big hit! It was interesting watching the kids waiting for your responses. A great experience for the kids and definitely worth doing again.

Our class tonight starts at 6:00 and ends at 7:30. I have set up a discussion board at padlet.com in hopes that some of you might participate and answer questions the students may have. They have designed a tank maintenance device and an app and could benefit from some feedback. If you are...