- High end stainless steel construction provides strong rust resistance compared with ordinary iron or aluminum dip sticks. - O ring seals the top of the dipstick to stay in the transmission fill tube and help ensure consistent readings. - Clear marks on the rod, including a prominent Safe mark, offer easy and unambiguous oil level readings. - Reading method: insert into the transmission fill tube until it bottoms out, then pull out to read. For accurate results, wipe the dipstick clean with tissue and reinsert before reading. - Designed to fit into transmission fill tubes and read standard oil levels; a reliable tool for routine checks. Use scenarios - At home car maintenance: check transmission fluid level during regular service to confirm proper fill. - Professional auto shop: use during transmission service to obtain repeatable, clear readings. - Fleet vehicle maintenance: convenient tool for quick, consistent checks across multiple vehicles.