R134a R410a R22a Air Conditioning Freon Refrigerant Leak Detector Halogen Gas Working temperature: 0 ??~ 52 ????? maximum sensitivity: the halogen refrigerants, 6 gr/yr Battery life: under normal use of about 50 hours???? maerial length: 20 cm Feet inches, 22.9 cm x 6.5 cm x 6.5 cm?