76 mm immersion type, mercury in glass, yellow enameled back, length 300 mm approx. In plastic case.

With drilled holes to accommodate 7 tubes up to 13 mm in dia. Strongly constructed with dovetail joints.

Constructed from a solid wood block, 15 out of 8 slotted holes accommodating tubes up to 13mm in dia and 7 slotted holes accommodating tubes up to 16mm in dia.

The top shelf contains seven holes for tubes upto 19 mm in dia. the lower has six holes for tubes up to 25 mm in dia. With six draining pins.

Strongly constructed, with 12 holes in one row and 12 draining pins. Ten holes accommodate tubes up to 25 mm in dia.

Made of wood with turned wood posts. Has holes for tubes up to 19 mm in dia.

With dove tail joining and 12 holes in two rows.

12 holes in two rows for tubes up to 25 mm in dia. and 12 draining pins.

Aluminium, made from thick anodised aluminium sheet, in three tiers.