Coils are wound with highly insulated copper wire impregnated with paraffin wax; input 6-8 V dc through two 4 mm socket terminals, with an adjustable trembler system. The spark suppression capacitor is housed in the base. A pair of pointer electrodes with insulated handles for adjustment of the spark gap is provided.

A set of ten models showing the L.H. of any one of the following insects, mounted on board, with key card.

Wooden, inner sides of the lid and bottom are lined with synthetic washable sheet, suitable for repeated pinning. Double walled, a perforated fumigation chamber is provided on all sides of the bottom frame for storing insecticide. With index card holder and clips.

This autoclavable trays have cover which fits into groove of trays to minimize spillage of material .Smaller size can be used to sterilize small instrument whereas the larger size allows pipettes to be fully immersed in disinfectant prior to sterilisizing.

100 times enlarged model with one entire villus, one longitudinally sectioned villus showing the arterioles and venules and one cut villus to show the lymphatic vessels, with enlarged representation of a longitudinal section of Lieberkuhn’s crypt.