BlueMETER Basic Set of two levels an indicating unit BlueMETER, Version 503 / 645, Base Type 122 Steel hardened, contact surfaces flat, precision lapped, with dust grooves remaining surfaces chromium plated, Mounting holes 130mm, Base Type 243 Angular b
Battery
BlueLEVEL BASIC 2 x 1.5 V Alkaline BlueMETER BASIC 3 x 1.5 V Alkaline