Refrigerant Leak Detectors feature visual leak-size indicators (Nos. 102679 and 102680 only), variable frequency audible alarm, flexible stainless steel probe with PTFE resin liner and constant power / low battery indicator. Advanced Digital Signal Processing—monitor the sensing tip up to 2000 times per second. Each measures 10-1/4" x 2-3/4" x 2-1/4". Weigh 1.2 lb. 14"L probe.