The armoury

Mini digital hygrometer

Various

A small reader for relative humidity. More useful than another sleeve you do not need.

Paper and foil want a stable room, roughly 40–55% relative humidity, not a bone-dry box and not a damp UK cupboard. Read the room the cards live in. Attics, cars and exterior walls swing too hard.

Fits

Any of these games

Use

Anywhere you store holos long term.

Price

Often about £6–12

Indicating silica gel

Various

A desiccant for a sealed box in a damp house. Rechargeable packs that change colour.

Use it when the hygrometer says the cupboard is wet, not by habit. Drying a box to an extreme makes paper brittle. Never let loose beads touch a card — buy pouches.

Fits

Any of these games

Use

A closed storage box in a humid room.

Price

Often about £5–10

A tool for a damp box, not a substitute for a sensible room.

Clean microfibre cloth

Various

For dust, dry, and almost nothing else.

A clean, dry cloth can lift loose dust. No water, no glasses spray, no alcohol, no baby wipes, no eraser. Liquids and abrasives mark the coating, and graders notice. If a card might be graded, do not clean it at all.

Fits

Any of these games

Use

A dusty sleeve or case — not the card face, if you can help it.

Price

Often about £3–6

Dry only. If you would not do it to a photograph, do not do it to a holo.