Please provide protocols for checking MIC of bacteria or a fungus by visible colour change without a microplate reader.
If you do not have microplate reader, turbidity of bacterial culture are observed to determine the inhibitory concentration (eye observation).
You may see this link as reference.
http://online.liebertpub.com/doi/10.1089/mdr.2015.0079
Make different concentration of antibiotic-agar media and put them in microtitre plate's wells. Make a known concentration of bacteria by standard serial dilution plating method. Then inoculate the wells with unit amount of bacterial suspension (say, 10 microliter). Next day, just observe the growth in plate. You'll be able to see the exact point where the antimicrobial agents has stopped the growth of bacteria without using a microplate reader. This will be a preliminary result, but it'll help you for sure.
Using p- aminotetrazolium violet (INT) as growth indicator the colour will change to pink in case of any bacterial growth or viability
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