Vintage Photography Tool "The Trident" Film Developing Weight

I am selling my late husbands camera collection, I do not have any camera knowledge 
but I am I am happy to TRY & answer any questions.

All camera's & associated equipment are being sold as UNTESTED - SOLD AS SEEN - NO RETURNS

Camera & accessories looks to be in good used vintage condition - Please view all photos for condition

“The Trident”, made by ensign mid 20th Century
to aid in the development of roll films in lengths.
An interesting ironstone piece with nice black transfer typography that displays well.

All over crazing, no chips, cracks or breaks.

Front: "The Trident" FOR DEVELOPING ROLL FILMS IN LENGTHS 
Back: Rd. No. 424609

Approx. Dimensions:
8.5cm x 11cm x 2.3cm

Please view ALL close up photos for true condition

 The images form part of the description, so please view all photographs for condition.

I have tried to photograph the items as well as possible but please contact me if you have any questions or wish to see something I have not shown.

I am happy to try & answer any questions.