Microwave Peanut coconut Brittle

Combine sugar, corn syrup, water and salt in 2 quart Pyrex or corning container. Mix well. Microwave on high, uncovered, for 5 minutes. Stir well and insert microwave candy thermometer (don't use regular thermometer) into syrup. Then microwave on high 13 to 15 minutes until thermometer registers 300 degrees. Stir in peanuts and coconuts. Microwave on high 1 to 1/2 minutes or until heated. Quickly mix in butter, soda and vanilla; stir just until light and bubbly. Pour onto butter cookie sheet. Spread to desired thickness. Cool and break into pieces. Store in covered container.