Petri Dish, poor quality
Terry Herdman from Livonia, MI USA
The top of the Petri dish I received had a diameter about 1/2" greater than the bottom and the rims of both dishes were uneven (see product pic), therefore it was impossible to create a good enclosure. They were unusable for my mini-cloud chamber experiment. The top dish literally "popped" apart when just the rim came in contact with dry ice. This dish was inexpensive and I got what I paid for.
xUmp.com reply: We are very sorry that this dish did not work for your purpose. We would be happy to exchange or return it for you. This product is not intended for research lab use but for kids science projects, hence the low price.