成人做爰免费视频免费看_成人a级高清视频在线观看,成人a大片在线观看,成人a大片高清在线观看,成人av在线播放,一a一级片,一级黄 中国色 片,一级黄 色蝶 片,一级黄色 片生活片

For pH meter standardization. Each pillow prepares 50 mL of fresh buffer solution. Color-coded for easy identification. pH is ± 0.02 at 25°C. Pack of 250 Powder Pillows

• Fresh and reliable

  Fresh and reliable

  Unit-dose powder pillows assure buffer freshness and eliminate the possibility of contamination.

  Specifications

  Concentration:4.01 ± 0.02 pH at 25 °C

  Description :pH Buffer Pillows, Color-Coded pH 4.01 （Red）

  Parameter:pH

  Platform :PP

  Quantity:250/pk

  Storage Conditions:10 °C to 30 °C

  Unit:250