Fluke 70 Series include: Fluke 21, 21 Series II, 23, 23 Series II, 25, 29, 29 Series II, 70, 70 III, 73, 73 Series II, 75, 77, 78, and 79. This will also apply to Fluke 50S, 50D, 51, and 52 Thermometers. The general style is the same on all of these Fluke 70 Series, and Fluke 70 Series II Multimeters.