is the Excalibur chess clock still legal for tournament play?

just wondering if the excalibur game 2 chess clock is still able to be used for tournament play and currently approved. i heard it was originally the official chess clock for the federation many years ago and am playing to buy it eventually so hope you guys can help me out here.

also I have my very own excalibur currently but cant tell if the batteries arent big enough or that the display is messed up cause it would show 3 zeros but can still be programmed to do 3 mins or whatever time control you want to set it too. its very weird so could you guys tell me if its broken or not? i rlly would like to buy another one if this one is broken also the image above isn't my excalibur so yeah thx

Why wouldn't it be? Tells time and switches between opponents.

Looks like a really cool clock

I played someone with one in November, so I don’t see why not 🤷‍♂️

A clock doesn't need to be "official" to use at chess tournaments. That's merely a marketing thing. Any clock that properly measures the time control specified for two people would work. If you played G/60 without delay or increment, then you could even use an hour glass. Of course, most modern tournaments require delay or increment, thus mandating a digital clock.

(Yes, someone could challenge the hour glass as being non-standard. But that person would also need to present a standard clock of their own. If not, then you can use the hour glass.)

In USCF tournaments, anything that can handle the TC of that tournament is legal. If it can't do increment but it can do delay, then the opponent can use his own. If he doesn't have one then he can request a spare clock from the TD.

Note: in USCF, black has choice of equipment and his decision stands unless white has equipment that more appropriately handles that particular tournaments TC.

There are a few at every local tournament in my city.

cause that was years ago and idk times have changed and certain clocks like chronos and excalibur are outdated/rare to get nowadays. chronos ik is still approved but rare to find while excalibur was once considered the "official" representing clock for US chess but that was also a long time ago like around 10 yrs ago so simply curious where it stands today in terms of being used in USCF play

I got a cheap clock from Amazon and noticed something really strange. For one side you can just touch it and the switch just drops straight down, the other side you have to physically push it all the way down. Seems like a minute advantage but an advantage all the same. I guess it pays to go for a little more quality.

It is capable of time delay. If a clock can be set to the controls for the tournament, it should be acceptable.

Chapter 1 of the USCF Rules has the answer.
https://new.uschess.org/sites/default/files/media/documents/us-chess-rule-book-online-only-edition-chapters-1-2-10-11-9-1-20.pdf

it works

I played against someone in tournament last weekend so...