Casio Pro Trek PRG-300 vs Casio Pro Trek PRG-340
Weight and specs compared for 2026 — and which one to choose.
Lightweight outdoor GPS smartwatch with triple sensors, barometric pressure, and Tough Solar charging. Compact 56×47×12.6mm design.
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Casio Pro Trek PRG-300 vs Casio Pro Trek PRG-340: which should you buy?
If saving weight is your priority, the Casio Pro Trek PRG-300 wins — at 57 g it is 9 g (14%) 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.