and base current begins to flow from the collector to the emitter along lead 66 as this occurs current flows to indicator led 54 illuminating the indicator 54 since small apertures 44 are used which may have a conical shape the beam intensity increases through the rotatable member 40 as the rotatable member 40 becomes more level and the apertures 44 are centered and directly in line with the beam 72 as this occurs the receiver phototransistor 52 senses a higher intensity in the beam 72 thus more current passes through the phototransistor 52 as this occurs the current sensed by the base of the transistor q 1 increases in lead 68 as this occurs the transistor q 1 senses an increase in base current of the pnp transistor as this occurs the pnp transistor q 1 enables more current to pass through it which in turn increases the intensity of the illumination of the indicator 54 thus a variable output is established the indicator 54 varies in intensity from off to its brightest point when the leveling device is in its most level position a plus or minus six 6 u00b0 degree range from level is present where the light goes on when the tool is further than six 6 u00b0 degrees away from level the light is in an off position when the power tool comes within the six 6 u00b0 degrees of level range the light begins to turn on as the light hits the level position the light at its brightest as it approaches the other side of the six 6 u00b0 degrees positive or negative the light would again go off thus the user can determine if he is high or low of the level.