Testing Underwater My Casio G-Shock Men's Watch W-735H-2A - Vibration Alarm

at 5/16/2016
Hi! I just want to make a suicidal review with my not so new Casio G-Shock W-735H-2A watch. It's been a few months now that I've purchased this watch but I can't find the time to test it underwater not until this summer of 2016. This watch is not originally mine. This was my then boyfriend's watch which he refused to use after we broke up. Anyway, here's how the watch looks like.

casio g-shock men's watch w-735h-2a-vibration alarm navy blue color review underwater
Photo is from Lazada.
What I like about this watch?
It's the vibration alarm feature. It's very convenient especially if you don't want to wake other people while they're sleeping. This watch vibrates instead of the usual annoying alarm clock sound. 

What's more to like?
I brought this watch because it's price is very affordable. It's only P1575.00 with P200.00 discount coupon from Lazada. I'm quite addicted to online shopping especially in Lazada. 

Other Features
  • It promises a 10-year battery Led light (high brightness) Dual time
  • Daily alarm, 1/100th-second stopwatch (24hr), 1/10th-second countdown timer (24hr), and high-brightness LED backlight
  • 44 mm stainless steel case with mineral dial window
  • Japanese quartz movement with digital display
  • Silicone band with buckle closure
  • Water resistant to 100 m (330 ft): In general, suitable for swimming and snorkeling, but not scuba diving
What do you mean by water resistant?
This is the degree where you can expose your watch to water. If you want to read the details about this topic, please visit Casio's page.  Anyway, for an easier explanation, I want you to look at the illustration below to check how waterproof your watch is. This specific watch is under the 100M water resistance case designation. This watch is wearable around sinks, during swimming, poolside diving, but not recommended for highboard diving and scuba surfing. 
Guideline on how many meters can your watch be placed underwater casio gshock vibration alarm atmosphere

How long can you immerse this watch underwater?
According to this site, most water resistant watches are not designed for prolonged active use in water. Water resistance is stated as a depth (BAR, ATM, meters or feet) this means that it has been tested in a laboratory to with stand a static pressure for a short period only at the stated depth. The number of Bars a timepiece can withstand is typically multiplied by ten when translated into meters of depth resistance. The guide below provides clarity with regards to how many Bars translate to how many meters, and how this is applicable to real life scenarios:
guide on how to translate your watch bars atmosphere pressure feet metres casio gshock tissot philipstein geneva timex bulova fossil
This watch is tested in accordance with the International Organization for Standard Regulations IS02281 which means that the minimum requirement that a watch will pass a 20 meter(66') test. Please check the guidelines below before wearing your watch underwater.

ISO 2281 Water Resistance Requirements:

  • Immersion of the watch in 10 cm of water for 1 hour.
  • Immersion of the watch in 10 cm of water with a force of 5 Newton perpendicular to the crown and pusher buttons (if any) for 10 minutes.
  • Immersion of the watch in 10 cm of water at the following temperatures for 5 minutes each, 40°C(104F), 20°C (68F)and 40°C(104F) again, with the transition between temperatures not to exceed 5 minutes. No evidence of water intrusion or condensation is allowed.
  • Immersion of the watch in a suitable pressure vessel and subjecting it to the rated pressure for 1 hour. No evidence of water intrusion or condensation is allowed.
  • Exposing the watch to an overpressure of 2 bar, no more than 50µg/min of air is allowed to get inside the case.
  • No magnetic or shock resistance properties are required.
  • No negative pressure test is required.
  • No strap attachment test is required.
  • No corrosion test is required.

However if the watch have a different rating then just plain Water resistant for instance a 30M, 50M,100M,200M etc rating then it needs to be tested in a pressure chamber with a static overpressure equivalent to the pressure at that depth. For your reference, check the requirements below. Source

Final Verdict
Yes. This watch can be worn underwater up to 100 m, 30 feet for a specific amount of time according to your usage. It is recommended to be worn in pool water only. It is not safe to be worn under the sea because the pressure under the sea is different than the pool.


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