There were two purposes of the study: 1) to development the Dissolved Oxygen Test Kits in the water for Science Laboratories on "The Method of Measure Dissolved Oxygen in the water (DO)". The researcher made the Producer by using manganese sulphate to oxidize oxygen content that dissolved in water and made the solution was high class different color follow oxygen quantity that dissolves in the water. 2) to study teachers' satisfaction on the Dissolved Oxygen Test Kits for measures oxygen quantity dissolves in the water. The results were as follows: 1. The Dissolved Oxygen Test Kits were able to measure DO of the water range of DO0-DO8. When using the Dissolved Oxygen Test Kits to measure DO of the water compared with the value of measuring DO of the water measured by standardized DO from Dissolved Oxygen Test Kits and standardized DO From Oxygen Meter. It was found that the value of DO of water measured by Dissolved Oxygen Test Kits could be estimated accurately at 98% confidence interval. 2. The teachers' satisfaction towards the Dissolved Oxygen Test Kits was at the high level.
Sanong Thongpan, Srinakharinwirot University, Thailand
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