Type 17. Micro short

- Two polished windows
 - Open top, supplied with non-sealing PTFE cover
 - Walls polished internally, fine ground externally.
 - Base thickness - 3mm
 
Type 18 & 18/B. Micro with lid

- Reduced nominal volume to <20% of Standard rectangular
 - Open top, with non-sealing PTFE cover.
 - Two polished windows
 - Walls polished internally, fine ground externally
 - Suitable for use with all standard cell holders
 
Type 28 & 28/B. Micro with stopper(s)

- Reduced nominal volume to <20% of Standard rectangular
 - Closed by PTFE stopper(s), providing a liquid-tight seal.
 - Two polished windows
 - Walls polished internally, fine ground externally
 - Suitable for use with all standard cell holders
 
