Exo Terra Digital Combination Thermometer/Hygrometer

Why it's worth it

A digital thermometer and hygrometer with a probe on a cord, so readings come from inside the enclosure instead of the room. It's the accessory experienced keepers tell beginners to buy first, and it fits in a card envelope.

Analog dial gauges — the round stick-on kind that come in starter kits — are notoriously vague. Digital readouts with a wired probe are the standard replacement, and this is the one that shows up most often in beginner advice threads. Crested gecko and hermit crab owners report it reacts quickly after a misting, which is exactly when you want to know what the tank is doing.

The real argument for this as a gift is quantity. One reading tells you almost nothing. Keepers want a warm-side number and a cool-side number, and the average keeper has 2.7 animals, so a couple of these across enclosures is genuinely useful. Two or three of them wrapped together makes a better present than one of anything else at this size.

From our review of 7 gifts for reptile keepers

What we like

• +Analog dial gauges — the round stick-on kind that come in starter kits — are notoriously vague
• +The real argument for this as a gift is quantity
• +Exo Terra is a mainstream brand carried by Petco, PetSmart and Amazon, which matters more than brand snobbery would suggest

What to know

• –It's slow to settle. Owners consistently note the temperature reading takes a while to stabilize after you move it, and a few…
• –The battery compartment is fiddly, and the coin cell it uses is easy to install wrong