Review of the Cressi Leonardo: Is this single-button ancestor still worth it?

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Learning how to scuba dive is an adventure that challenges our terrestrial perspectives. During the first dives, a beginner diver's brain is overwhelmed with new information.

He must manage his buoyancy, monitor his breathing, and adapt to a liquid environment that does not tolerate inattentiveness. In this context of intensive learning, the equipment must be unobtrusive.

It is precisely with this extreme focus on simplicity that certain instruments have forged their legend over the decades. They can be found attached to the vests of students in training centers.

They provide reassurance with their familiar presence, their simple design, and their ability to withstand the handling errors that are inherent in taking your first steps underwater.

The Cressi Leonardo undoubtedly belongs to this category of historical equipment. It defined the very concept of a first purchase for an entire generation of enthusiasts.

Although it has been replaced by the Donatello in the manufacturer's main catalog, it continues to flood the second-hand market and clearance sales.

This test aims to objectively analyze its current capabilities. We will determine whether this older design with a single button still deserves a place on your wrist.

The rapid technological advancements of recent years have redefined industry standards. High-definition color displays and customizable algorithms have become commonplace.

Faced with this wave of innovations, a basic monochrome computer may seem outdated. However, the reliability of a proven system still holds undeniable appeal for many users.

Safety always comes first over equipment. A dive computer is a decision-making aid, never an absolute guarantee. Its algorithm is a mathematical model, not an exact reflection of your physiology.

We will examine every aspect of this device to understand whether it still meets current safety requirements.

Overall score: 3.0/5

Algorithm & tiers (3.4/5)

Dive computer management is the core of any dive computer. The Leonardo relies on Cressi's proprietary RGBM algorithm.

This mathematical model was developed in collaboration with researcher Bruce Wienke. It is known for its conservative approach.

This algorithmic caution is a major asset in preventing decompression sickness among recreational divers who perform multiple dives consecutively during a trip.

The gradient factors cannot be adjusted manually on this machine. However, the system offers three configurable safety factors to adjust the calculations based on your individual needs and tolerance.

The SF0 level corresponds to the standard setting for optimal conditions. The SF1 level adds a safety margin for more demanding dives or in cases of slight fatigue.

The SF2 level is the most restrictive and is ideal for cold water or inverted profiles. The display focuses on essential information, including the time until ascent and the depth of the mandatory decompression stop.

The alerts are both audible and visual, indicating an ascent rate that exceeds ten meters per minute. A graphical alert also warns of oxygen toxicity.

It is a healthy, proven, and protective foundation for recreational profiles. However, the lack of fine-tuning options for microbubbles limits its use for technical divers.

Air & mixed gases (1.7/5)

Simplicity has its limits when it comes to advanced planning. This device is a single-gas computer. You must configure it for either air or nitrox before entering the water.

The oxygen percentage is adjustable from 21% to 50%. The partial pressure of oxygen can be adjusted between 1.2 and 1.6 bar. It is technically impossible to change gases underwater.

This limitation restricts its use to dives without changing tanks. Logically, Trimix or rebreather modes are absent from this price range.

Air integration via transmitter is also not available. This lack of integration does not affect our rating according to our reference framework for this entry-level category.

It is absolutely essential to keep a classic analog pressure gauge on your regulator to monitor your gas supply.

For a beginner diver, this single-gas restriction is actually an added safety measure. It avoids complex handling errors underwater during initial dives.

However, as soon as you want to optimize your decompression using an over-oxygenated bailout bottle, this computer will reveal its insurmountable limitations.

Screen & Ergonomics (2.6/5)

The visual interface is based on a monochrome segmented LCD screen. The display intelligently organizes essential information with large numbers.

The readability is so straightforward that even with reduced visibility, essential data remains perfectly decipherable at a glance.

A temporary backlight assists with reading during night dives or in dark environments. However, the physical ergonomics are a major weakness of this model.

The navigation relies on a single mechanical button. A short press is required to scroll through the menus sequentially in one direction only.

A long press confirms a selection. If you miss the desired parameter, you are forced to repeat the entire menu sequence from the beginning.

This navigation logic requires patience, a systematic approach, and understanding. It can be a frustrating learning experience for those accustomed to modern touch-screen interfaces.

Wearing thick gloves in cold water further complicates the operation of this single button. The pressure required to activate it demands a certain amount of strength, which can become tedious.

Battery Life & Performance (3.7/5)

Basic electronics offer a clear advantage in terms of energy consumption. The Leonardo is a digital workhorse.

Its battery life is estimated to be approximately two years, or around fifty dives, depending on the use of the backlight and audible alarms.

A clearly visible battery gauge on the main screen allows you to anticipate the end of the power source before embarking on a trip.

The device uses a standard CR2430 button cell battery. The waterproof compartment is designed to be opened by the user without requiring any special tools.

A single coin is enough to unscrew the cover and proceed with the replacement. This technical independence provides immense relief for traveling divers.

It is no longer necessary to send the computer back to the workshop for a simple maintenance operation. This significantly reduces long-term operating costs.

However, it is crucial to strictly follow the cleaning instructions when changing the battery to avoid any water ingress that could cause damage.

Connectivity & App (2.6/5)

The computer's internal memory stores the history of approximately sixty dives or seventy hours of immersion time.

Extracting this valuable data to a digital dive log reveals the design age. There is no built-in native Bluetooth chip in the case.

To synchronize your profiles, you need to acquire a specific interface that is sold separately. This base uses an infrared connection to the computer.

The transfer process using the proprietary Cressi software is slow and has limited interoperability with modern third-party dive logbooks.

It's an outdated procedure at a time when wireless synchronization with a smartphone has become the absolute standard on cruise ships.

Analyzing your dive profiles therefore requires you to sit in front of a desktop computer with a cumbersome cable.

Keeping a digital dive log is an excellent habit for tracking your progress and analyzing your gas consumption over time.

This physical constraint often discourages divers from regularly updating their digital dive logs.

Compass & Instruments (2.1/5)

The instrumentation focuses exclusively on the primary decompression calculation function. There is no integrated electronic compass to help you navigate the reef.

Freediving enthusiasts will also find no dedicated mode with ultra-fast depth sampling.

The device offers three operating modes: Air, Nitrox, and Gauge. The Gauge mode transforms the computer into a simple depth gauge coupled with a timer.

This mode is useful for technical divers who calculate their decompression using dive tables, or for use as a backup system.

A temperature sensor continuously displays the water temperature throughout the dive, allowing you to monitor your thermal comfort.

Underwater orientation is a fundamental skill that requires regular practice. Using a traditional analog compass remains the most reliable method for learning the basics of navigation.

The lack of a digital compass will require you to invest in a separate analog compass for your underwater navigation exercises.

Solidity & Depth (3.5/5)

The case made of thermoplastic polymers is a real hockey puck. It's thick, solid, and designed to withstand the worst kinds of abuse.

The marine environment is particularly harsh for precision electronics. Salt, sand, sunlight, and thermal shocks put the materials under great stress.

Dive centers appreciate its ability to withstand impacts from boat ladders and accidental drops onto the deck.

The maximum operating depth is certified at 120 meters. This provides a huge safety margin for an instrument designed for recreational diving.

The LCD screen is protected by the housing structure, but the glass remains susceptible to scratches if it is not covered with its transparent plastic protective film.

It is strongly recommended to keep this removable protective layer in place to preserve the long-term readability of your investment.

The elastomer strap is sturdy and long enough to fit over a thick wetsuit without requiring any extensions.

Price & Customer Service (4.1/5)

The pricing is a major selling point for this model, especially as it nears the end of its commercial life. It's often found at heavily discounted prices, typically around €150 to €180 when new.

The used market is full of units at even lower prices. It's a financially unbeatable way to acquire a personal safety device.

Cressi's after-sales service is a long-standing European player with local presence, based in Italy and Spain. The support is good, and spare parts are readily available.

However, the manufacturer applies very strict warranty terms. A malfunction caused by user error will receive very little tolerance from customer service.

The availability of spare parts such as straps or screen protectors is guaranteed for many years to come.

The Cressi Leonardo is primarily aimed at leisure divers of level 1 with a very limited budget. It's the typical equipment for beginners taking their first dives.

The choice of a diver's first computer often influences their progress. It is crucial to define one's medium-term goals before making a purchase.

It is perfectly suited for those looking for a basic, durable tool that only needs to be used for air or single-mix Nitrox diving during their annual vacations.

Conversely, this model is not ideal for regular divers who want to progress to multi-gas decompression dives.

Those who enjoy analyzing their dive profiles on their smartphone as soon as they return to the boat will be deeply frustrated by the lack of Bluetooth connectivity.

Finally, if you lack patience with digital interfaces, the single-button navigation might quickly become frustrating for you.

The longevity of a piece of equipment depends largely on the quality of technical support provided by the manufacturer. Cressi has a well-established European after-sales service.

This geographical proximity to Italy and Spain allows for generally reasonable processing times for repairs and maintenance.

However, it is important to keep in mind that the brand applies a strict policy regarding warranty terms.

Technicians tend to be intolerant of breakdowns that result from user negligence.

Any water ingress resulting from an improperly performed battery replacement or a poorly lubricated O-ring will be systematically charged for.

This level of precision requires the owner to be meticulous, attentive, and cautious during routine maintenance operations.

The network of authorized resellers is extensive, which makes it easier to get initial support for your equipment in case of a proven malfunction.

Energy management is a source of peace of mind during long trips. Choosing a user-replaceable CR2430 button battery is a very relevant technical decision.

Energy autonomy is often underestimated when making a purchase. However, a battery failure in the middle of a dive trip can ruin your vacation if you don't have an immediate backup solution.

You are not dependent on a proprietary charger or an available power outlet on a cruise ship.

Simply slip one or two spare batteries into your dive bag to ensure your device functions even in the most remote locations.

The replacement is done in a few minutes with a simple coin.

It is important to work in a dry, clean, and well-lit environment to ensure that no grains of sand compromise the seal of the O-ring.

Applying a tiny amount of silicone grease to the new seal is recommended to ensure a perfect seal when closing the compartment.

To find out which battery to buy for this computer, check out our complete guide on batteries for dive computers. To learn how to replace the battery yourself step by step without risking damage, read our complete tutorial on how to change your own battery.

If you are drawn to the Italian brand's philosophy but find the limitations of the Leonardo model restrictive, other options are available within their product range.

The direct successor is the Donatello, which modernizes the display and finally introduces the long-awaited Bluetooth connectivity.

You can find our detailed analysis of this model on our Cressi Donatello review.

For those who categorically refuse single-button navigation, the manufacturer offers more ergonomic alternatives.

The Giotto, for example, integrates three buttons for smooth menu navigation, while still maintaining the secure RGBM algorithm.

Feel free to consult our Cressi Giotto review to assess whether this level of user comfort justifies the additional investment.

Understanding decompression is far more crucial than knowing which button to press. Mastering your dives requires knowledge, practice, and continuous self-reflection.

To compare this computer with other models, see our diving computer comparison tool.

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