If you have questions about our products you own, Fill out the form below and we will answer any questions you have. Tips: Fields marked with*are required. Low Cost FOG Rate Gyroscope ER-FOG-25 ( 1-5°/h) ◆ Bias: 1-5°/h; ◆High Precision & Low Cost; ◆Specially Designed Substitute of Liquid Floating Rate Gyro.