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Casio Pro Trek PRG-340 vs Garmin Instinct 3 Solar 45mm

Weight and specs compared for 2026 — and which one to choose.

Garmin Instinct 3 Solar 45mm is the lighter option — 13 g lighter than the Casio Pro Trek PRG-340 (20% less weight). If grams matter to you, that is the one to beat.
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Spec Casio Pro Trek PRG-340 Garmin Instinct 3 Solar 45mm
Weight 66 g · 0.066 kg · 0.15 lb 53 g · 0.053 kg · 0.12 lb
Brand Casio Garmin
Category Electronics Electronics
Casio Pro Trek PRG-340
66 g

Solar-powered outdoor watch with triple sensor.

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Garmin Instinct 3 Solar 45mm
53 g

Rugged solar-powered GPS watch. 36-90 days smartwatch battery with solar charging capability.

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Casio Pro Trek PRG-340 vs Garmin Instinct 3 Solar 45mm: which should you buy?

If saving weight is your priority, the Garmin Instinct 3 Solar 45mm wins — at 53 g it is 13 g (20%) lighter than the Casio Pro Trek PRG-340 (66 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.

See where both rank against everything else in this category on the lightest electronics page, or browse the full gear weight database.

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