Engineer Ashish - Thermometer ka hona most important hai ab. Aur ye digital thermometer + non contact thermometer se best koi thermometer nahi hai. Sbse jaruri abhi yhi hai mere liye bhi,
Floating Pond Thermometer for Fish Pond Temperature Winter Summer Koi | eBay
Amazon.com : Zacro Petbank Digital Aquarium Thermometer, Fish Tank Thermometer, Water Thermometer with Large LCD Display, Reptile Thermometer for Fish Tank Water Terrarium : Pet Supplies
KoiMedicPro 3-in-1 pH, Salinity, thermometer [3-1PRO] - $149.99 : Sea Side Aquatics, The Best Out There