Blue Sea Systems Mini OLED Temperature Monitor, 12V/24V DC, 1-1/8 in Hole Mount, -40°F to 250°F

Overview

The Blue Sea Systems Mini OLED Temperature Monitor is a compact panel-mounted temperature display for 12V DC and 24V DC marine electrical systems. It reads temperature from -40°C to 125°C (-40°F to 250°F), shows the value in Fahrenheit or Celsius, and uses an OLED screen that remains readable in daylight and wet conditions.

The monitor fits a common 1-1/8 in mounting hole, which makes it practical for helm panels, electrical panels, cabin control stations, and equipment spaces where panel space is limited. It is a good match for boats that need a simple way to keep an eye on battery compartments, machinery spaces, lockers, or other areas where temperature matters.

Key features

• Works with 12V DC and 24V DC systems, covering the most common small-boat and yacht electrical setups.
• Displays temperature from -40°C to 125°C (-40°F to 250°F), with selectable Fahrenheit or Celsius readings.
• OLED screen is daylight readable and waterproof, so the display stays usable in exposed or damp marine locations.
• Mounts in a common 1-1/8 in hole for a neat panel installation without needing a large cutout.
• IP66 rating supports use where spray, washdowns, and moisture are part of normal boat life.
• Reverse polarity protection helps protect the monitor during DC wiring and service work.
• 1°F or 1°C resolution with ± 1.25% accuracy gives clear readings for routine monitoring on board.
• Low 10mA operating current keeps the load on the DC system minimal.

Variants

This Mini OLED Temperature Monitor is offered in two screen color configurations. Both versions are temperature monitors for 12V DC and 24V DC systems, mount in a common 1-1/8 in hole, read the same temperature range, and use the same 10mA operating current.

The main visible difference is the display color. The yellow screen has a warmer panel appearance, while the blue screen has a cooler look that can match other blue-backlit instruments or switch panels.

• 1741: Screen color yellow. This version suits panels where a yellow OLED display is easier to distinguish from nearby gauges or warning indicators.
• 1741200: Screen color blue. This version fits installations where a blue display better matches the rest of the helm or electrical panel layout.

Installation and setup

The compact body makes the monitor easy to place near the equipment being watched or in a main monitoring area at the helm. A 1-1/8 in round cutout is the key panel requirement, so it can sit alongside switches, DC meters, breaker panels, or other Blue Sea Systems components without taking up much space.

For DC wiring, match the installation to the vessel’s existing 12V or 24V system and protect the circuit according to the boat’s electrical plan. The reverse polarity protection is helpful during installation, but clean terminations, proper strain relief, and a dry service loop still matter in a marine environment.

Use cases on board

This monitor works well for owners, installers, and service technicians who want a small temperature display without adding a larger multifunction meter. Typical locations include battery areas, engine room spaces, electrical lockers, refrigeration-related compartments, or any area where a quick temperature check helps with routine operation.

Because the display is compact, waterproof, and readable in daylight, it can be used in both protected interior panels and more exposed control areas where space is tight and conditions change quickly.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Orders of $100 or more qualify for free shipping when eligible. For orders under $100, shipping costs are calculated at checkout based on destination, package weight, and selected service. International shipping is available for eligible products, and certain items may require additional handling, warehouse transfers, or may ship directly from the manufacturer, which can affect processing time.

Deliveries are handled by preferred carriers such as USPS, UPS, FedEx, DHL, and others depending on your location and selected service. Estimated delivery times are displayed at checkout and may vary due to customs processing, carrier delays, weather, postal disruptions, or other circumstances beyond our control. Once your order ships, you'll receive a confirmation email with tracking information. Tracking may take up to 24 hours to update on the carrier's website and is also available through your account when applicable.

We ship throughout the United States and to most international destinations for products eligible for international shipping. International orders may be subject to customs duties, taxes, brokerage charges, or other import fees, which are the customer's responsibility and are not included in the product or shipping price. PO Boxes are accepted only when shipping through USPS, and not all packages qualify for this option. If your order does not arrive within the estimated delivery window, please contact us at info@apollolighting.com or +1 (954) 375-0100 so we can assist with locating your package.

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Returns may be requested within 30 days of receiving your order. Items must be unused, uninstalled, unaltered, and returned in their original packaging with all tags, packing materials, blank warranty cards, manuals, instructions, accessories, and included items. Certain products, including installed or used electronics, electrical components, lighting, consumables, custom or special-order items, cut-to-length products, safety equipment, and merchandise exposed to water or marine conditions, may not be eligible for return.

To request a return, sign in to your account and select the applicable order and items, and submit your request for review. Eligible unfulfilled items may also be submitted for cancellation within 1 hour of placing the order. Returns or cancellations are not considered approved until you receive confirmation from Apollo Lighting. Please do not ship or drop off merchandise before receiving return approval and instructions.

Customers are responsible for arranging and paying for return shipping unless the return is due to an error by Apollo Lighting or the item is verified as defective, damaged, or incorrect. Missing, damaged, defective, or incorrect items must be reported within 2 business days of delivery, and photos or other documentation may be required for review. If the issue is verified, Apollo Lighting may provide or reimburse return shipping and issue a replacement or refund depending on the circumstances. International customers are responsible for return shipping, duties, taxes, customs charges, brokerage fees, and other costs associated with an international return.

After your return is received and inspected, approved refunds are issued to the original payment method and may take 5-7 business days to appear after processing. Original shipping and handling charges are nonrefundable, and the value of any included free items that are not returned may be deducted from the refund. Apollo Lighting does not charge a standard restocking fee on eligible returns. Returns that are incomplete, damaged, installed, used, altered, improperly packaged, or otherwise do not meet the eligibility requirements may be refused. We recommend using a trackable and appropriately insured shipping service for all customer-arranged returns.

For assistance, contact info@apollolighting.com or call +1 (954) 375-0100.

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Many products sold by Apollo Lighting include a manufacturer's warranty covering defects in materials or workmanship. Warranty terms vary by brand, product category, and model, so eligibility, coverage duration, exclusions, and available remedies are determined by the applicable manufacturer. We recommend reviewing the warranty information provided with your product before installation or use, especially for marine electronics, navigation equipment, lighting, electrical systems, pumps, safety equipment, and other specialized marine products.

If you need warranty service, the claim must follow the process established by the manufacturer, authorized service center, or designated warranty provider. You may be asked for proof of purchase, a serial number, product registration, photos, maintenance or installation records, or other documentation. Apollo Lighting does not determine or modify a manufacturer's warranty coverage or final claim decision, but we are happy to help provide purchase information and direct you to the appropriate manufacturer or warranty resource.

Keep your receipt, product documentation, serial number information, and original packaging when practical. Damage caused by normal wear, misuse, improper installation, insufficient maintenance, corrosion, impact, unauthorized modifications, electrical issues, or operation outside the manufacturer's specifications may not be covered. Warranty claims are separate from standard returns, so a product that has been installed, used, or exposed to marine conditions may no longer qualify for return while still remaining eligible for evaluation under the manufacturer's applicable warranty.

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