Where it lives
The solid brass loop on the lid clips to a key ring, so it's in your hand before you need it.
For the badge you wear all day. [TBC – lanyard compatibility]
Clipped to a bag or a notebook band with a recycled carabiner.
Pick yours
Field Mouse from ¥6,000
Five colours, each with a brass lid.
Field Mouse Metals from ¥8,600
Brass or stainless steel all over.
Gift set
A Field Mouse and a leather fob, boxed and ready to give. Small enough for a stocking.
Compatible inks
Over 30 colours. It takes all of them.
Every Tom's Studio ink made to run through the fieldmouse, so the pen you use for on-the-go notes is the same one you use for a waterproof address label or a quick field sketch.
- Fountain pen & fibre tip inks30+ colours
- Waterproof inkfor notes that get wet
- Permanent inkfor labels and addresses
Mini Ink Collections
The easiest way to try a few colours without committing to a full bottle. Each set is hand-painted and signed in the studio.
Before you ask
- Length capped – 63mm
- Length uncapped – 54mm
The Field Mouse is compatible with all standard Fountain Pen Inks and we have a beautiful range of colours here. Please note the Field Mouse is not suitable for use with our Shimmer Fountain Pen Inks or Calligraphy Inks.
Some ink colours can concentrate in the tip, so you may experience a lighter colour after a line or two. This is completely normal and looks quite nice!
Looking for a waterproof option? We’d suggest our No.60 Pigment Black, Sailor Kiwa-guro or Platinum Carbon inks - we’ve tested both, and they flow beautifully.
You can expect the high-quality, Japanese-made tip to last for months of use. When the tip eventually dulls, you can find packs of three replacement tips here.
Yes. Fobs and carabiners are sold on their own.
Refillable, for life
Ink from the bottle, tips you can swap, every part is repairable and replaceable. If something breaks, we have spares and accessories available at all times or you can pop it in the post and we will repair it in the studio.