Our oil level gauges are usually manufactured of brass and feature a patented dual-chamber protection system with a stainless steel grid as impact protection. This two-chamber system with integrated protective grid withstands projectiles up to a mass of 30g and a speed of 50m/s. In case of a damage to the sight glass due to a stronge impact, the gear oil will not leak out. Different thread dimensions are available (see table), other threads are available upon request. The operating temperature is -40 ° C ... +105 ° C (<5 min) to 150 ° C for a short time. A reflector can be mounted and markings applied, if desired.