A look at what is currently available on eBay
 AZ-8707 Hygro Thermometer Temp & Humidity Meter Tester US $99.90 
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 7-in-1 pH °C °F ORP EC CF TDS Meter Tester Thermometer US $89.00
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 Digital pH Monitor Tester Meter Adapter Thermometer °C US $43.50
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