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What Depth Meter?

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.
There are dire problems in making a cheap diving computer.

One problem lies in the labor. In order to make a $200 dive computer, the labor involved must be only a matter of minutes, in order to make it financially feasible. After all, for a $200 computer, the dealer will take a $30 cut (at least), there will be $7-$10 in credit card fees.

In every venture I have made so far, selling the product for 3 times the manufacturing cost (including labor), still barely breaks you even. You really need to sell something for 4 times your own cost, which is why the F1 is probably not viable, as it is being sold for only 1.5 times our cost.

$200
- $30 dealer cost
- $10 credit card fees
= $160 gross income
divided by 4
= $40 our cost for labor + parts

For a hand made product, labour would be a minimum of 2 hours, for at least $20 per hour, giving $40. This leaves $0 left to buy parts with.

So, the only way to do it would be to have machine automated assembly, with no human labor involved, or, alternatively, increase the price to $300.

For $300:
dealer cut $45
credit card fees $12
= $243
divided by 4
= $60.75
2 hours labor @ $20/hr
= $40
left over = $20.75

So the parts would need to cost $20.75. This is problematic since a pressure sensor alone costs at least $12, the circuit would cost at least $3 (in giant quantities), the battery would cost at least $7, and even without other circuit components or casing or strap we are already over the limit.

So, I would say the cheapest I could ever make a computer would be $450, unless it was assembled by an automated factory, which costs hundreds of thousands of dollars to set up and offers great risks.
 
The F1 looks great, well done Eric !
I agree there is no way you can manufacture something cheap unless it's mass production and machine produced.

I don't know what the fuss is with the D3's, I've had one for ages and know heaps of people (20+) that use them with very few problems. They have been used to verify compition results and even world records, I wouldn't describe them as unreliable. The only problem I've had and a friend had was it went in a funny mode where it locked up which required the battery taken out to reset it, only happened once in 2 years. Also loosing the first few seconds on a dive when you graph it but is no big deal. I know of only 1 person that had their D3 totally die (flooded), and when I pulled it apart it was the glass face that was cracked because it actually had been dropped previously, so hardly the fault of SUUNTO. I've changed the battery in my D3 and my mosquito, without even changing the O ring (I know I'm bad ) and never had it flood, still been good to 80m.

Like I said I know heaps of people that use them without problem, so am a bit confused why people are describing them as being unreliable. If you do have an obviously faulty D3 soon after purchase, then you couldn't you just bring it back to the shop?

Is it possible that there are bad batches in manufacturing of the D3's, that show up more in one country then another, or a particular year ?

Cheers,
Wal
 
I used to wonder about the fuss too, untill my D3 pooped after a year. In my opinnion, a year is just not long enough. I would brush it off as a bad sample or something, but numerous people have had similar experiences. It would not always start at all during a dive and I got profiles suggesting that I dove to 45 meters in 2 seconds etc...

Ok, sure, for a lot of people they also work for years.

I have to give it to Suunto though, that their warranty service works. I just sent mine in, without any receit or anything, they sent me a new one within days. This one has not had problems so far.

I sure understand the agony of whittling down the costs...If you push the price of materials lower and lower, the price of labor becomes more and more significant.
 
Anyone know or use Casio SPF-70 in freediving ?
please let me know your think on it , thanks

http://www.sporttek.co.uk/Casio_Sea...der_SPF_70.html

I too have been eye balling one of these. All I have been able to find out is that they are "HUGE!!!" and "Plastic feeling". But nothing on reliability, function, warranty, Battery life, etc.

They look great on paper, but does anyone REALLY know anything about them?

~James
 
Last edited:
Some specif. of Casio SPF-70........................

• Depth Gauge
Measuring range:
Depth: 0 to 30 m (0 to 98 ft.)*; Elapsed time: 2:59'59"
Maximum; Water Temperature: -10 to 60°C (14 to 140°F)
*Note that depths between 0 and 1 meter (0 to 4 feet) are registered as 0.0 m (0 ft.)
Display unit; 0.1 m (1 ft.)
Submerged Time: Measured in 1-second increments
Memory Capacity: 1 log data record (total time submerged, maximum depth, water temperature at maximum depth)
*Changeover between meters (m) and feet (ft.)



Sorry, My english is very poor
Is that mean 1 second sampling rate?
 
I don't remember what the sampling rate is on these, but if you are referring to: "Submerged Time: Measured in 1-second increments" that just means that you can see how long you have been done in seconds and minutes. Which is good because some SCUBA watches/timers only display the dive time in minutes.

Till later...

~James
 
Yes, that means 1 sec sampling rate, sampling rate is the number of times the watch checks to see how deep it is, on a mosquito it's every 2 seconds, in a d3 it's once every second, the importance of this is only the fact that if you spend less than 2 seconds at the bottom on your max depth then maybe you won't get the same reading than with a D3... etc.
 
what about Mares M1? it's around 220euros without pc interface, and has Current depth / maximum depth achieved, Water temperature, Dive time in minutes and seconds (in bottom time mode), Surface time, Air temperature, Log book for storing 50 dives in memory...
any experience?
 
If there was a Lidl or Aldi for freedivers, they would sell Casio marine gears! I have Casio MRS 301 and it's great for basics - logs last 10 dives depth and time info. Bummer is it only displays depth during dive not time without button pressing. Cheap, cheerful and measures to 50m - cost $79 new, happy with that
 
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