Tortoise thermostat probe melted — best replacement

A melted probe is a serious warning sign — it means the probe was either too close to the heat source, wasn't rated for the temperatures involved, or both. Before we find you a replacement, reptile welfare is almost entirely determined by getting the environment right: temperature gradient, UV, humidity, and substrate all need to match your specific species' natural habitat, and the thermostat is the backbone of all of that. So — what species of tortoise, how old are they, and what heat source was the probe sitting next to when it failed?

Right, that's a classic placement mistake — and honestly it's not your fault, because most budget thermostats ship with probes that can only handle around 60–70°C, and directly under a 100W halogen you're easily hitting 80°C+ at the probe tip. The thermostat body may well be fine, but a deformed probe gives you inaccurate readings, which means your Hermann's could be sitting in temperatures that feel regulated but aren't. For a four-year-old Hermann's you want a basking spot of around 32–35°C, with a cool end around 20–22°C. Can I ask — are you just replacing the probe, or are you open to replacing the whole thermostat unit if the replacement is significantly more reliable?

Good call. The one I'd point you to is the Microclimate Evo Dimmer thermostat. It's a dimming thermostat — which is exactly what you want for a halogen basking bulb, because it dims rather than switching on and off, so the bulb lasts longer and the temperature holds much more steadily. Critically, it comes with a high-quality probe rated to handle higher ambient temperatures, and the build quality is a significant step above the budget units. Microclimate are a UK company, they've been the go-to for serious reptile keepers for years, and their customer support is actually useful if something goes wrong. For a Hermann's on a halogen setup, it's the straightforward choice. Position the probe at tortoise height on the cool side of the basking zone — not directly under the bulb — and you'll get accurate, stable readings.

Stick with the dimmer for a halogen. Pulse thermostats work by rapidly switching power on and off, which is fine for ceramic heat emitters and infrared bulbs, but it shortens the life of standard halogen and incandescent bulbs noticeably — and with some bulbs it causes a faint flickering that can stress reptiles. Dimmers reduce the voltage smoothly, so the bulb runs cooler when less heat is needed and there's no flickering at all. The Microclimate Evo Dimmer is specifically designed with this in mind. You're making the right call replacing the whole unit — peace of mind on temperature control for a tortoise is genuinely worth the extra spend.

Perfect. One last tip when you set it up: place the probe at the level your tortoise actually moves around, roughly midway between the basking spot and the cool end, and check your temperatures with a separate digital thermometer for the first day or two just to confirm the readings match. Thermostat probes can drift slightly until they've settled. She should be in much better shape with a stable basking gradient and a unit you can actually trust.