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Step 3:

This photo shows the completed ringer with a slide  which has been prepared with a ring of sealant ( pale green colour in the photo ) attaching an O ring.  Small insect specimens can be added in the cavity formed by the O ring prior to applying another ring of sealant and a coverslip. 

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More by kymyst: "MELT-O-MATIC" DIGITAL MELTING POINT APPARATUS Home Made Molecular Model Kit A TEMPERATURE CONTROLLED LABORATORY HEATER
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