Head-to-Head Comparison

Updated September 5, 2026

Casio MTP-S120L Solar Field vs Casio Pro Trek PRW3500T-7

Casio's field watch meets Casio's diver

Quick Verdict

The Casio MTP-S120L Solar Field ($100–$150) offers Casio Tough Solar Quartz precision in the tier below the Casio Pro Trek PRW3500T-7 ($250–$500). The MTP-S120L Solar Field measures 42mm (49 x 42 x 10.9mm) and is rated 100m (10 ATM). The Pro Trek PRW3500T-7 counters with Casio (Japan) craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective tiers.

CasioMTP-S120L Solar Field$100–$150 Check price CasioPro Trek PRW3500T-7$250–$500 Check price

Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.

Casio

MTP-S120L Solar Field

$100–$150

Check Price Full Review

Casio

Pro Trek PRW3500T-7

$250–$500

Check Price Full Review

Specifications Compared

Feature	Casio MTP-S120L Solar Field	Casio Pro Trek PRW3500T-7
Price	$100–$150	$250–$500
Case Size	42mm (49 x 42 x 10.9mm)	56.9 × 53.4 × 14.8mm
Movement	Solar-Powered Quartz	Tough Solar (Solar Quartz), Radio-Controlled
Caliber Type	Casio Tough Solar Quartz	Tough Solar Quartz, Multi-Band 6
Power Reserve	Months on a full solar charge; no battery replacement	Tough Solar (Rechargeable)
Water Resistance	100m (10 ATM)	200m (20 ATM)
Crystal	Mineral Crystal	Mineral Glass
Case Material	Stainless Steel	Resin / Stainless Steel, Titanium Bracelet
Origin	Casio (Japan)	Casio (Japan)

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Casio's approach

The Casio MTP-S120L Solar Field features a Stainless Steel case at 42mm (49 x 42 x 10.9mm) with Mineral Crystal protection. The Casio Pro Trek PRW3500T-7 offers Resin / Stainless Steel, Titanium Bracelet construction at 56.9 × 53.4 × 14.8mm with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Draw

Solar-Powered Quartz vs Tough Solar (Solar Quartz), Radio-Controlled

The MTP-S120L Solar Field runs the Solar-Powered Quartz (Casio Tough Solar Quartz, Months on a full solar charge; no battery replacement power reserve) at standard frequency. The Pro Trek PRW3500T-7 uses the Tough Solar (Solar Quartz), Radio-Controlled (Tough Solar Quartz, Multi-Band 6, Tough Solar (Rechargeable) reserve) at standard. Power reserves are closely matched.

📏

Wearability & Fit

Edge: Casio

42mm (49 x 42 x 10.9mm) vs 56.9 × 53.4 × 14.8mm — different wrist presence

At 42mm (49 x 42 x 10.9mm), the MTP-S120L Solar Field wears more compactly on smaller wrists compared to the Pro Trek PRW3500T-7 at 56.9 × 53.4 × 14.8mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio MTP-S120L Solar Field sits at $100–$150 and the Casio Pro Trek PRW3500T-7 at $250–$500. On the specs that outlast any price: the MTP-S120L Solar Field uses Mineral Crystal with Months on a full solar charge; no battery replacement, against Mineral Glass and Tough Solar (Rechargeable) on the Pro Trek PRW3500T-7. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Casio

100m (10 ATM) vs 200m (20 ATM)

The MTP-S120L Solar Field is rated to 100m (10 ATM) while the Pro Trek PRW3500T-7 handles 200m (20 ATM). The Pro Trek PRW3500T-7 offers superior water resistance.

Our Verdict

Casio

MTP-S120L Solar Field

Choose the Casio MTP-S120L Solar Field if you prioritize Casio Tough Solar Quartz engineering, Casio (Japan) craftsmanship, and 100m (10 ATM) water resistance. At $100–$150, it delivers Solar-Powered Quartz with Months on a full solar charge; no battery replacement power reserve.

Check Price on Amazon

Casio

Pro Trek PRW3500T-7

Choose the Casio Pro Trek PRW3500T-7 if you value Tough Solar Quartz, Multi-Band 6 technology, Casio (Japan) heritage, and 56.9 × 53.4 × 14.8mm proportions. At $250–$500, the Tough Solar (Solar Quartz), Radio-Controlled with Tough Solar (Rechargeable) power reserve makes it a compelling choice.

Check Price on Amazon

Try Prime Free — Free Shipping on Both Watches Students & 18–24: start Prime for Young Adults free

The Bottom Line

The Casio MTP-S120L Solar Field and Casio Pro Trek PRW3500T-7 represent two distinct approaches to fine watchmaking — the Casio bringing Casio (Japan) tradition while Casio delivers Casio (Japan) engineering.

Frequently Asked Questions

For water, the Casio Pro Trek PRW3500T-7 is rated 200 m against 100 m, which is the difference between swimming and diving on one side and splashes on the other. On price, the Casio MTP-S120L Solar Field sits a band lower ($100–$150 against $250–$500), 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 MTP-S120L Solar Field offers better upfront value, sitting a tier lower at $100–$150. However, the Casio Pro Trek PRW3500T-7 may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The MTP-S120L Solar Field at 42mm (49 x 42 x 10.9mm) with 100m (10 ATM) water resistance handles everyday situations. The Pro Trek PRW3500T-7 at 56.9 × 53.4 × 14.8mm with 200m (20 ATM) is similarly capable. The MTP-S120L Solar Field uses Mineral Crystal while the Pro Trek PRW3500T-7 uses Mineral Glass.

More Comparisons

Casio Pro Trek PRG601 vs PRW3500T

Two Triple Sensor solar Pro Treks

Tag Heuer Carrera Chronograph vs Casio MTP-S120L Solar Field

Tag Heuer's chronograph meets Casio's field watch

Tag Heuer Carrera Chronograph vs Casio Pro Trek PRW3500T-7

Tag Heuer's chronograph meets Casio's diver

Explore These Watches

Casio MTP-S120L Solar Field — Full Review Casio Pro Trek PRW3500T-7 — Full Review Browse All Guides

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.