A student is conducting an experiment to determine how cold temperatures affect the growth of tadpoles in a tank of water. Which instrument would give the most accurate measurement of water temperature?
a calibrated bulb thermometer that has a readout from –15°C to 25°C
a calibrated digital thermometer that has a readout from 50°C to 250°C
an uncalibrated bulb thermometer that has a readout from 0°C to 100°C
an uncalibrated digital thermometer that has a readout from –10°C to 100°C

Question

A student is conducting an experiment to determine how cold temperatures affect the growth of tadpoles in a tank of water. Which instrument would give the most accurate measurement of water temperature?
a calibrated bulb thermometer that has a readout from –15°C to 25°C
a calibrated digital thermometer that has a readout from 50°C to 250°C
an uncalibrated bulb thermometer that has a readout from 0°C to 100°C
an uncalibrated digital thermometer that has a readout from  –10°C to 100°C