Description: Paint Thickness Gauge: This is a magnetic paint thickness gauge. Its magnetic tip is extremely convenient in reaching curved surfaces, and in hard to reach places. For paint thickness with an accuracy of 20 microns. Waterproof: Its mechanical thickness gauge is water resistant, no batteries needed and can be used in the rain and on a dirty car. Features: Quickly and accurately check if the vehicle has been painted in the past.Its shaped as a small pen, and is made of high quality materials, making it the perfect choice to carry around and always be prepared. Easy to Use: Used to increase invisible paint coat thickness on steel and galvanized steel vehicles. No battery required. craft. Waterproof, high precision, good reliability and easy to use. Durable and practical. Functions: The tester instrument is highly accurate with a micron level color scale due to its compatibility with digital thickness gauge. Colored gauge shows you exactly what you're dealing with as to thickness of metals and the paint on it, and it will easily reveal any damages. Specification: The individual colors on the ruler give: Blue: Coat thickness 0.0-100 microns - a thin coat of varnish (no foundation or repolished varnish) Green: The original varnish is 100 to 200 microns thick. Warning; in newer models, a thickness of 180 microns can represent a thin layer of second varnish. Yellow: After paint repair ("second coat"), the coating thickness is 200-300 microns. Red: Coating thickness 300-520 microns - repaired surface of metal sheet + second coat of varnish. Black: The coating thickness is over 520-surface putty and varnish (the amount of putty is about 0.5mm) Size Chart: 13x1x1cm/5.0.392x0.39x1inch Package Includes: 1 Piece Paint Thickness Gauge