Immersion shells are needed for accurate immersion biometry when using the Keeler A-Scan unit. Clear shell for improved visibility and contains two sight lines, one for probe alignment and one for accurate water level. These guide rings are vented to provide proper fluid flow and eliminate air bubble formation in the shell lower chamber. The shell contains a device to secure the probe into position as well as an adapter for tubing. Shell is 14mm in diameter. Only compatible with the Keeler A-Scan unit.
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