Write the expected range where the sitter cannot miss it
A temperature log only helps a sitter spot a fault quickly if the expected range sits at the top of the page, in plain numbers, before any readings. Write the warm end range, the cool end range and the expected night-time drop for that specific enclosure, and name the animal it belongs to, because a sitter covering two reptiles should never have to guess which range belongs to which vivarium. Under that header, keep a simple table: date, time, warm end reading, cool end reading and a notes column. Ask for the actual numbers every time rather than ticks or the word fine, because a slow drift across three days is invisible in ticks and obvious in numbers.
Readings taken the same way, at the same times
A sitter spots enclosure faults fastest when every reading is taken the same way. Fix two check times that fit the sitter's day, usually morning and evening, and state which thermometer or probe each number comes from, since a basking spot surface reading and an air temperature at the same end can differ widely. Show the sitter where each probe sits and ask them to note if a probe has slipped, been buried by substrate or ended up pressed against a heat source, because a displaced probe is the most common cause of a frightening reading in a healthy enclosure. Consistency matters more than frequency: two comparable readings a day reveal trends that five random ones hide.
Make an out-of-range reading impossible to overlook
An enclosure fault announces itself in the log only if abnormal readings stand out visually. Agree a simple marking system in advance, such as circling any reading outside the written range or adding an exclamation mark in the notes column, and ask the sitter to write what they observed beside it: heater light off, both ends reading the same, room unusually cold, or the animal sitting somewhere it never normally sits. Identical warm and cool readings suggest a failed heat source or a dead thermostat, while a sudden spike suggests a stuck-on heater, and the note beside the number helps you tell those apart from a distance. The sitter should never have to decide alone whether a marked reading matters; the mark itself is the instruction to contact you.
Agree the fault response before you leave
A temperature log protects the animal only when it connects to actions the sitter is allowed to take. Write the response steps beside the log: first confirm the probe is in its usual place, then check the heater and thermostat are powered, then message you with the readings and a photograph of the enclosure dials if needed. State clearly what the sitter may adjust and what they must not touch, and leave the vet's number and your backup contact on the same page. If readings stay outside the range and you cannot be reached, the written instruction should say who can authorise a vet visit or a move to a temporary enclosure, so no decision waits on an unanswered phone.
Review the log together when you return
An enclosure temperature log earns a final few minutes when the sit ends. Read it through with the sitter and ask about any marked readings, odd notes or changes in the animal's behaviour, because a reading that recovered on its own can still point to a thermostat beginning to fail. Transfer the numbers into your own ongoing records so the week away becomes part of the enclosure's history rather than a gap in it, and note anything you want done differently next time while the experience is fresh. Each sit then improves the next sitter's page. KinsLe supports that handover directly, since Care Pass hands a trusted sitter temporary clear access to a pet's care routine and key details while the owner is away.