9 Monitoring instruments, namely, monitors for measuring oil, water, salinity and solid values in drilling fluid; Electric monitoring control apparatus, namely, monitors for measuring oil, water, salinity and solid values in drilling fluid; Electric monitoring units for use in measuring oil, water, salinity and solid values in drilling fluid; Electronic monitoring instruments, other than for medical use for monitoring oil, water, salinity and solid values in drilling fluid; Measuring, detecting and monitoring instruments, indicators and controllers, namely, electric sensors; Remote monitoring apparatus, namely sensors for measuring oil, water, salinity and solid values in drilling fluid; Electric monitors for monitoring oil, water, salinity and solid values in drilling fluid; drilling fluid analysis equipment, namely, measuring instruments for measuring the viscosity of fluids; computer software for analyzing fluids