Head-to-Head Comparison

Updated September 5, 2026

Casio MRW-230H vs Tag Heuer Aquaracer Professional 300

Casio's timepiece meets Tag Heuer's diver

Quick Verdict

The Casio MRW-230H (Under $50) offers Casio Quartz (Battery) precision in the tier below the Tag Heuer Aquaracer Professional 300 ($2,500–$5,000). The MRW-230H measures 44.6mm (47.9 x 44.6 x 12.3mm) and is rated 100m (10 ATM). The Aquaracer Professional 300 counters with Swiss Made craftsmanship and 300m (30 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMRW-230HUnder $50 Check price View the dossier

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Casio

MRW-230H

Under $50

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Tag Heuer

Aquaracer Professional 300

$2,500–$5,000

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Specifications Compared

Feature	Casio MRW-230H	Tag Heuer Aquaracer Professional 300
Price	Under $50	$2,500–$5,000
Case Size	44.6mm (47.9 x 44.6 x 12.3mm)	43mm
Movement	Quartz	Automatic Caliber 5
Caliber Type	Casio Quartz (Battery)	Automatic (ETA 2824-2 / Sellita SW200 base)
Power Reserve	Approx. 3-year battery (SR626SW)	38 Hours
Water Resistance	100m (10 ATM)	300m (30 ATM)
Crystal	Resin Glass	Sapphire with Anti-Reflective Coating
Case Material	Resin case, aluminum bezel ring	Stainless Steel
Origin	Casio (Japan)	Swiss Made

Category-by-Category Analysis

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Design & Aesthetics

Edge: Draw

Casio's design language vs Tag Heuer's approach

The Casio MRW-230H features a Resin case, aluminum bezel ring case at 44.6mm (47.9 x 44.6 x 12.3mm) with Resin Glass protection. The Tag Heuer Aquaracer Professional 300 offers Stainless Steel construction at 43mm with Sapphire with Anti-Reflective Coating. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Tag Heuer

Quartz vs Automatic Caliber 5

The MRW-230H runs the Quartz (Casio Quartz (Battery), Approx. 3-year battery (SR626SW) power reserve) at standard frequency. The Aquaracer Professional 300 uses the Automatic Caliber 5 (Automatic (ETA 2824-2 / Sellita SW200 base), 38 Hours reserve) at 28,800 vph (4 Hz). The Aquaracer Professional 300 offers a longer power reserve.

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Wearability & Fit

Edge: Tag Heuer

44.6mm (47.9 x 44.6 x 12.3mm) vs 43mm — different wrist presence

At 44.6mm (47.9 x 44.6 x 12.3mm), the MRW-230H has a bolder wrist presence compared to the Aquaracer Professional 300 at 43mm. Water resistance differs: 100m (10 ATM) vs 300m (30 ATM).

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Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MRW-230H sits at Under $50 and the Tag Heuer Aquaracer Professional 300 at $2,500–$5,000. On the specs that outlast any price: the MRW-230H uses Resin Glass with Approx. 3-year battery (SR626SW), against Sapphire with Anti-Reflective Coating and 38 Hours on the Aquaracer Professional 300. Service intervals are typically 5-7 years for both.

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Water Resistance

Edge: Tag Heuer

100m (10 ATM) vs 300m (30 ATM)

The MRW-230H is rated to 100m (10 ATM) while the Aquaracer Professional 300 handles 300m (30 ATM). The Aquaracer Professional 300 offers superior water resistance.

Our Verdict

Casio

MRW-230H

Choose the Casio MRW-230H if you prioritize Casio Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At Under $50, it delivers Quartz with Approx. 3-year battery (SR626SW) power reserve.

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Tag Heuer

Aquaracer Professional 300

Choose the Tag Heuer Aquaracer Professional 300 if you value Automatic (ETA 2824-2 / Sellita SW200 base) technology, Swiss Made heritage, and 43mm proportions. At $2,500–$5,000, the Automatic Caliber 5 with 38 Hours power reserve makes it a compelling choice.

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The Bottom Line

The Casio MRW-230H and Tag Heuer Aquaracer Professional 300 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Tag Heuer delivers Swiss Made engineering.

Frequently Asked Questions

The Tag Heuer Aquaracer Professional 300 is the better buy if you want a mechanical movement; the Casio MRW-230H is the better buy if you want quartz accuracy with no servicing. For water, the Tag Heuer Aquaracer Professional 300 is rated 300 m against 100 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Casio MRW-230H sits a band lower (Under $50 against $2,500–$5,000), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Casio MRW-230H offers better upfront value, sitting a tier lower at Under $50. However, the Tag Heuer Aquaracer Professional 300 may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The MRW-230H at 44.6mm (47.9 x 44.6 x 12.3mm) with 100m (10 ATM) water resistance handles everyday situations. The Aquaracer Professional 300 at 43mm with 300m (30 ATM) is similarly capable. The MRW-230H uses Resin Glass while the Aquaracer Professional 300 uses Sapphire with Anti-Reflective Coating.

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How This Page Was Made

Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.