Adtemp* GPK 30 - 40 Second Digital Thermometer Kit, Reads in as little as 30 seconds (typical response time 30-40 seconds), Replaceable 1.55v (LR41) type battery provides up to 4,500 measurements, Scabbard carry case keeps instrument sanitary
Marina Standing Thermometer - Celsius and Fahrenheit, designed to sink to the bottom of the aquarium and remain in a vertical position, Centigrade, Has a safety zone temperature range indicator for most tropical fi