Explosion Proof Tachometers is front panel programmable for single or multiple pulses per revolution and scaling. It offers a fixed or floating decimal point and supplied with remote optical, infrared, laser, proximity, magnetic pickup or eddy current probe sensors. It is directly compatible with a TTL input and 200mV to 50 Vac signal. They have front panel programmable alarm set points, 4-20mA, 0-5 Vdc, TTL and RS232 outputs.