• Durable, Easy to use liquid nitrogen ruler

• Proper way to measure liquid nitrogen level of semen tank

• This is a MUST have product for semen tank owners

• Reads 1-50cm

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Highly durable plastic liquid nitrogen ruler specifically made for liquid nitrogen. Everyone that owns a semen tank SHOULD own one of these! These solve a LOT of headache and questions on the level of nitrogen in your tank. They measure 50cm and will work in 99.9% of semen tanks.