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Hydrometers are nice
5040 Refractive Index Refractometer - NO ARMOR JACKET
The honey refractometer is designed for government honey inspectors
°C or °F measurement
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Hungry Koi Extra Large Solar Pond Automatic Feeder Carp, Catfish Salinity Refractometer Hydrometers are niceItem Description: Hungry Koi EXTRA LARGE SOLAR POWERED Automatic Pond Feeder EXTRA LARGE FOOD HOPPER! Ideal for MANY fish to be fed over a short period of time, or a few fish for a longer duration KOI CATFISH SALMON TILAPIA EXTRA LARGE food hopper holds approximately 11 pounds of MEDIUM sized pellets Outside Use 6v Rechargeable Battery via Solar Indoor Use DC Supply Charger included Feed up to 10 times per day Adjustable feeding time (1 to 59 seconds)