Guide: 1. Burner: The main purpose of the burner is heating, so the wall thickness is required to be uniform. It shouldn't be too thin or too thick for better when heated...

1. Burner: The main purpose of the burner is for heating, so the wall thickness is required to be uniform. It should not be too thin or too thick, so that it is good for heating. 2. Dish tube and bottle bucket: Dish tube mainly depends on its wall thickness and smoothness; bottle bucket mainly depends on its uniform wall thickness. The frosted part should be fine and the sealing should be better. 3. Measuring device: The main purpose of the measuring device is to measure the solution in order to make sure the accuracy is high, especially the graduated pipette, pipette pipette, burette, etc. These are divided into A and B grades.

4. Complete sets of instruments: There are many types of complete sets of instruments including accessories mainly depending on the fine workmanship and the thickness of the glass tube, the frosting is very important indeed!

5. Vacuum type: The vacuum type instrument requires that the sanding must be in place which the sealing should be excellent. 6. Sand core filter: It is required that the welding of the sand core and the glass need good quality to ensure water won't leak. 7. Thermometer and float meter: It is required that the measurement should be accurate with better workmanship. 8. Matching latex and rubber products: the wall thickness of the product cannot be too thin to pursue better pull-up property.