德國JOLA浮動開關JOLA Spezialschalter K. Mattil Co. KG 是一家總部位于德國Lambrecht的中型企業，創建于1952年，致力于液位控制領域的研發和發展，現在員工約70人，其液位控制產品在市場上也頗有名氣。Jola Spezialschalter K. Mattil & Co. KG的產品有液位控制器,液位傳送器及測漏儀等產品。
產品型號：
SS, FS, TS Mercury-free floating switches and immersion probes with potential-free micro-contact
SM SM float switches
SMR SMR magnetically operated float switches
MK MK float switches
TSR, RN, TSM TSR, RN and TSM immersion probes
TSR/Ex TSR EEx immersion probes
NTR Immersion probes with free connecting cable
HMW, HA, NVM, ENVM Magnetic switches; level indicators and level controllers with magnetic switches
TSK-MWU-SKG Continuous liquid level indicators of the TSK-MWU-SKG range
PKG 4-20 Liquid Level Transmitter for continuous level
measurement
SDS/PP SDS/PP pressure head switch
ATNP Level controllers on the air bubble injection principle
EH, LWZ, S, NR, ES Electrode controls
EL/Ex, NR/Ex Electrode controls for use in potentially explosive atmospheres
PST Pump control systems
KR, ESA Protection relays and alarm relays
KR/Ex Intrinsically safe protection relays

德國JOLA測漏儀，德國JOLA液位控制器，德國JOLA液位傳送器