T435 dc-operated high-precision servo inclinometers from Sherborne Sensors are designed for down-hole logging applications or for use in areas where space is at a premium. Measuring 1.6 in high and less than 1.46 in diameter, the single-axis, closed-loop sensors can be stacked for simultaneous x and y measurement of tilt angles. Models range from ±3° to ±90°. A high-level dc output signal is proportional to the sine of the available angle of tilt. The self-contained units can connect to a dc power source and readout or control device for a complete operating system. They can withstand a 1500 g shock event.