Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Hydrometer

Due to changes in commercially available antifreeze the use of a hydrometer may give an incorrect reading. The hydrometer should be used to test ethylene glycol based antifreeze only. Ethylene glycol based antifreeze is recommended for year round use.