The TM4594 is a solid-state electronic hourmeter with an SAE bright stainless steel bezel and a 6-digit mechanical counter. The TM4594 records the operating time of vehicles or powered equipment. It is an electromechanical instrument and has a quartz base time counter that ensures accuracy. All it requires is a DC power source. This model can record up to 99,999.9 hours and includes an automatic recycle to zero hours feature. This model has a shockproof and tamperproof, totally sealed case made of an engineered plastic. This small lightweight time meter is rugged and durable. It is the answer to applications requiring a low DC power, reliable hourmeter.