# Propeller Shaft Revolution Indicator Nunotani Keiki D1-120B - Marine Speed Monitor

The **Propeller Shaft Revolution Indicator Nunotani Keiki D1-120B** is a crucial component for accurately monitoring the speed of your marine vessel's propeller shaft. Manufactured by Nunotani Keiki Seisakusho Co., Ltd., this indicator is designed for precision and reliability in the demanding marine environment. This instrument is essential for ship captains, marine engineers, and boat owners, providing real-time data to ensure optimal vessel performance and safety.

This **revolution indicator**, with a model number **D1-120B**, operates with an input voltage of 110V and is suitable for use in Japan. Its lightweight design at 190 grams makes it easy to install and integrate into various marine setups. The **Nunotani Keiki** brand is synonymous with quality, making this indicator a trusted choice for monitoring propeller shaft speed. The **D1-120B** is engineered to withstand the rigors of marine use, providing accurate readings in both ahead and astern directions.

-   **Accurate RPM Display:** Provides precise readings of propeller shaft revolutions per minute, with a range from 0 to 120 RPM in both ahead and astern directions.
-   **Durable Construction:** Built to withstand harsh marine environments, ensuring long-term reliability and performance.
-   **Easy Installation:** Designed for straightforward integration into existing marine systems.
-   **High Visibility:** Features a clear and easy-to-read display for quick and accurate speed monitoring.
-   **Brand Reliability:** Manufactured by Nunotani Keiki, a trusted name in marine instrumentation.

Specifications: Input Voltage: 110V. Weight: 190 grams. Display Range: 0 to 120 RPM (ahead and astern). Application: Marine vessels. The **Nunotani Keiki D1-120B** ensures that you can always monitor your vessel's performance. Trust in the quality of **Nunotani Keiki** for your marine instrumentation needs. Contact [Ram Automations](mailto:info@ramautomations.com) for inquiries.

## Details

- **Price:** 999.0 USD
- **Vendor:** Nunotani Keiki
- **Type:** Marine Equipment > Navigation > Speed Indicators
- **Tags:** D1-120B, marine equipment, marine speed monitor, Nunotani Keiki, propeller shaft revolution indicator, RPM indicator

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| New | 999.00 USD | In stock |

## Images

- Propeller Shaft Revolution Indicator Nunotani Keiki D1-120B - Marine Speed Monitor-Ram Automations

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> Source: [Ram Automations](https://ramautomations.com/products/nunotani-keiki-d1-120b-rpm-indicator)
> Updated: 2026-09-18