TPM-10F digital thermometer

I bought this digital thermometer to measure the water temperature when I shower, among other things.

When you search for "digital thermometer" on eBay, it's among the cheapest results. You can tell if it's the same from the temperature range. This goes from -50 to 70°C. I think the pure hot water from my house goes above 70°C.
Although it's very cheap, about $3, I would not recommend getting it as it updates ridiculously slowly. By counting, I estimate it updates once every 30s. This makes it useless for any form of temperature control.
Oh, and I enjoy showers with a temperature of 35°C.