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Stanley One-person measuring up to 40' without assistance. Intuitively-designed toggle button offers 3 measuring modes (length, area & volume). Automatically calculates area and volume. Manual mode for specialized calculations (i.e., perimeter). Large, easy-to-read LCD screen displays last 3 measurements for quick reference. English or metric modes.
Accuracy: ± 0.5% @100'.
Requires 9V battery, sold separately