W-FI (Magnetometers)
Western Instruments manufactures 4 models of Disposable Field Indicators, which provide readings in Gauss;
1. W-FI-10 - Intended to be used for Demagnetization and are calibrated during manufacture in a Homogeneous Field (Helmholtz Coil +/- 10 Gauss).
2. W-FI-20 - Intended to check residual fields, and are calibrated during manufacture for a Homogeneous Field (Helmholtz Coil +/- 20 Gauss).
3. W-FI-50 - Intended to check strong residual fields, and are calibrated during manufacture for a Homogeneous Field (Helmholtz Coil +/- 50 Gauss).
4. W-FI-100 - Intended to check very strong residual fields, and are calibrated during manufacture for a Homogeneous Field (Helmholtz Coil +/- 100 Gauss).