AMPTEC 620LK-P5 Intrinsically Safe Ground Bond Tester Ohmmeter AMPTEC 620LK-P5 is an affordable, highly accurate, and intrinsically safe ground continuity meter. AMPTEC’s 620LK-P5 is available at discount pricing from AMPTEC’s authorized worldwide distributor, ATEquip. The 620LK-P5 is very user-friendly, as it automatically reads the continuity between the earth ground and the part under test to