If you are working in an environment that is dirty (i.e., dust, or other airborn matter) it is best to limit the exposure of the sphere to this. A simple suggestion is to keep the instrument in it's case until it is needed for measurements. Another suggestion would be to keep a small plastic bag handy to cover the shoe and keep the shoe locked in the closed position when not in use. The instrument accuracy is directly affected by the cleanliness of its sphere. All Sphere instruments leave the factory meeting tight tolerances to ensure inner-instrument agreement. As the sphere gets dirtier, accuracy may drift from it's original factory settings. This will affect inner-instrument agreement. To clean out loose dirt and debris use compressed air.
If you use a freon propelled compressed air system, never invert the can. This will contaminate the Sphere.
CAUTION: NEVER USE SOLVENTS OF ANY KIND!!
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