Robic SC-505W 12 Memory Stopwatch


“The most popular stopwatch for Champions at every level. The Robic SC-505W is a dedicated stopwatch, meaning it has no other timekeeping functions to distarct the user. Take it out of the box and start using it the first time, correctly and with confidence. Simple enough for the first time user yet advanced enough to time every event. Ultra-precise, multi-mode stopwatch with memory recall and lap counter. Advanced timekeeping functions yet easy to use. Lap, split or event timing. 1/100 second precision to 24 hours. Twelve (12) memory recall. Auto-lap counter to 199. Auto lap/split release. Single action time readings. 1st – 12th place times. Time-out (pause) timing. Shows current running lap or split time. Extra large display with big numbers. Water Resistant to 30 meters. Break-Away Safety Lanyard helps prevent accidents, promotes safe use. ”

$ 24.99

Customer Reviews


1 of 1 people found the following review helpful
2.0 out of 5 stars
NOT 1/1000th second precision, January 2, 2012
Verified Purchase(What’s this?)
The Robic SC-505W stopwatch is advertised as being 1/1000th second precision to 24 hours. I purchased two of these units as timers for a test pinewood derby track, which requires high accuracy over about a 2 second range. I carefully opened the units up and connected an external electronic trigger circuit to their start/stop and reset buttons. To test the two units, I used the electronic trigger circuit to trigger their start/stop buttons at the exact same time. I also connected a digital oscilloscope to the trigger circuits and start/stop buttons to confirm the integrity of the test. What I found was that there was up to a +-40/1000 of a second difference between the two test units over a 2 second period of time! The test was repeated 20 times; in 6 cases the times were identical, in 5 cases sample A had a greater time, and in 9 cases sample B had a greater time. In otherwords, the error was not repeatable, therefore, I could not simply offset the error and still use the SC-505W units as timers.

I later called the distributor for Robic and explained what I had found. The representative stated that the units were accurate to something like 2 seconds over a 1 year period of time. I explained that I was not looking for accuracy over 1 year, rather accuracy over a time period less than 10 seconds. His final statement was “what do you expect from a stopwatch”.

In fairness to Robic, I tested another inexpensive timer and found similiar results, but that timer at least only advertised 1/100th second precision. I should also point out that the internal and external construction of the SC-505W was very rugged. But, it is simply not accurate, even at 1/100th second precision, never mind 1/1000th precision.

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1 of 1 people found the following review helpful
3.0 out of 5 stars
Not all that I expected, January 3, 2014
By 
P. D. Renfrew (Southborough, MA USA) – See all my reviews
(REAL NAME)
  

Verified Purchase(What’s this?)
I expected a stopwatch time that would do SPLITS and then…give me the FINAL TIME of the race, which this doesn’t. This NOT what a coach would want and wish I could upgrade. 🙁

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5.0 out of 5 stars
The only stopwatch I buy is Robic., July 12, 2014
Verified Purchase(What’s this?)
I’ve had many Robic timers in various colors. Great consistent product.

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