As most currency pairs are priced to 4 decimals places ($0.0001) the smallest change would be to the last number after the decimal point for example: $0.0001 which is illustrated as the one indicated on this example. The difference between a pip and pipette is simply a 5 decimal place and not 4 such as a pip.
For most pairs a pip is equivalent to 0.01% or 1/100th of one percent, this value is also commonly referred to as BPS. A basis point (BPS) refers to a common unit of measure for interest rates and of their financial percentages. One BPS is equal to 1/100th of 1% or 0.01% (0.0001) and denotes a percentage change in the exchange rate.