SIEMENS MILLTRONICS ME 100 MOTION ALARM, IN TWO VERSIONS. THE HL MODEL OFFERS SELF CALIB- RATION WITH ALARM RELAY DE- ENERGISING ABOVE AND BELOW PREDETERMINED ALARM POINTS.WITH THE ZS MODEL,RELAY WILL DE-ENER GISE WHEN THE PULSE RATE DROPS BELOW 8 PULSES/MIN.BOTH MODELS ARE POTTED STAINLESS STEEL CONSTRUCTION, IP65