The variable lid contains 10 holes allowing progressive variation of escaping vapour. This achieved by closing each hole off independently via a small control lever.
These scent lids offer a progression from the perforated lid which has a static 8% perforation. With the variable you can shut down the amount of escaping vapour. Hole 1= 0.01%, 2=0.2%, 3=0.25%, 4=0.35%, 5=0.45%, 6=0.50%, 7=0.60%, 8=0.70%, 9=0.80%, 10=0.90%.
Even with no holes exposed the Dog will still indicate, but you can be sure the Dog is indicating on some very small vapours and you have done your training well!
The variable scent lid is designed to fit the universal scent pot and NATO carousel only. They are made from stainless steel and can be sterilised in an autoclave or standard dishwasher.