REC 300 Digital Receiver measure moreintelligently work more efficiently Two displays front & rear Water & dustproof to IP 67 70 hour operating life with 2 x LR 6AA alkali batteries Automatic switching off after 30 minutes plus signal Operating temperature 20AC 60ACDigital display of the reference deviation in mm Read the deviation from the reference height directly in figures exact mm readings Eg faster & more precise correction of strut positions & concrete levels No troublesome moving the receiver on the levelling rod Measuring made simple A series of symbols indicate your distance from the reference height & whether you are too high or low Two sensitivity levels simplify settingup over longer or shorter distances If you also switch on the acoustic signals you can select two volume levels