I had the 1250n a long time ago and it has never let me down. Don't worry about the battery or cables. However, they must maintain a constant crankshaft RPM (there is an LED speed indicator) to alert you. It's harder to work with than electronic blocks, but it's always been the benchmark for the old-school megger. I use mine to increase my electronic blocks.
π Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
8 Review
π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review
β Stainless Steel L-Square, Size 3-Inch x 4-Inch, Zona 37-434
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π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review